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Matematika A2a 2008/3. gyakorlat - Laptörténet
2024-03-29T10:21:03Z
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2017-02-19T19:57:07Z
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<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:57-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">206. sor:</td>
<td colspan="2" class="diff-lineno">206. sor:</td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^2y-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4y-x^2y^3+3x^2y^2-y^5-2x^4y+2x^2y^3}{(x^2+y^2)^2}=\frac{x^4y+x^2y^3+3x^2y^2-y^5}{(x^2+y^2)^2}</math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^2y-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4y-x^2y^3+3x^2y^2-y^5-2x^4y+2x^2y^3}{(x^2+y^2)^2}=\frac{x^4y+x^2y^3+3x^2y^2-y^5}{(x^2+y^2)^2}</math></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>\partial_1(\partial_{1}f)(0,0)=\lim\limits_{x\to 0}\frac{x^4\cdot 0+x^2\cdot 0^3+3x^2\cdot 0^2-0^5}{x(x^2+0^2)^2}=0</math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>\partial_2(\partial_{1}f)(0,0)=\lim\limits_{y\to 0}\frac{0^4y+0^2y^3+3\cdot 0^2y^2-y^5}{y(0^2+y^2)^2}=\lim\limits_{y\to 0}\frac{-y^5}{y^5}=-1</math></ins></div></td></tr>
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2017-02-19T19:52:44Z
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<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:52-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">205. sor:</td>
<td colspan="2" class="diff-lineno">205. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div></math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div></math></div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^2y-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4y-x^2y^3+3x^2y^2-y^5-2x^4y+2x^2y^3}{(x^2+y^2)^2}=\frac{x^4y<del class="diffchange diffchange-inline">-</del>x^2y^3+3x^2y^2-y^5}{(x^2+y^2)^2}</math></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^2y-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4y-x^2y^3+3x^2y^2-y^5-2x^4y+2x^2y^3}{(x^2+y^2)^2}=\frac{x^4y<ins class="diffchange diffchange-inline">+</ins>x^2y^3+3x^2y^2-y^5}{(x^2+y^2)^2}</math></div></td></tr>
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2017-02-19T19:50:22Z
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<td colspan='2' style="background-color: white; color:black;">←Régebbi változat</td>
<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:50-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">205. sor:</td>
<td colspan="2" class="diff-lineno">205. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div></math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div></math></div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^2y-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4y-x^2y^3+3x^2y^2-y^5-2x^4y<del class="diffchange diffchange-inline">-</del>2x^2y^3)}{(x^2+y^2)^2}</math></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^2y-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4y-x^2y^3+3x^2y^2-y^5-2x^4y<ins class="diffchange diffchange-inline">+</ins>2x^2y^3<ins class="diffchange diffchange-inline">}{(x^2+y^2</ins>)<ins class="diffchange diffchange-inline">^2}=\frac{x^4y-x^2y^3+3x^2y^2-y^5</ins>}{(x^2+y^2)^2}</math></div></td></tr>
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2017-02-19T19:48:17Z
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<td colspan='2' style="background-color: white; color:black;">←Régebbi változat</td>
<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:48-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">205. sor:</td>
<td colspan="2" class="diff-lineno">205. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div></math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div></math></div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^<del class="diffchange diffchange-inline">2</del>-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^<del class="diffchange diffchange-inline">4</del>-x^2y^3+3x^2y^2-y^5-2x^4y-2x^2y^3)}{(x^2+y^2)^2}</math></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:<math>\partial_{1}f(x,y)=\frac{(3x^<ins class="diffchange diffchange-inline">2y</ins>-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^<ins class="diffchange diffchange-inline">4y</ins>-x^2y^3+3x^2y^2-y^5-2x^4y-2x^2y^3)}{(x^2+y^2)^2}</math></div></td></tr>
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2017-02-19T19:46:36Z
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<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:46-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">198. sor:</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>\end{matrix}\right.</math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>\end{matrix}\right.</math></div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>1) Polárkoordinátásan könnyen kijön, hogy ez a függvény totálisan deriválható.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>1) Polárkoordinátásan könnyen kijön, hogy ez a függvény totálisan deriválható<ins class="diffchange diffchange-inline">. Parciális deriváltjai a 0-ban: 0</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>2) Melyek a parciális <del class="diffchange diffchange-inline">deriváltjai és azok </del>deriváltjai a 0-ban?</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>2) Melyek a <ins class="diffchange diffchange-inline">második </ins>parciális deriváltjai a 0-ban?</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>f(x,y)=\frac{x^3y-xy^3}{x^2+y^2}\qquad (x,y)\ne(0,0)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>\partial_{1}f(x,y)=\frac{(3x^2-y^3)(x^2+y^2)-2x(x^3y-xy^3)}{(x^2+y^2)^2}=\frac{3x^4-x^2y^3+3x^2y^2-y^5-2x^4y-2x^2y^3)}{(x^2+y^2)^2}</math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>\partial_{1}f(x,y)=\begin{cases}0,& \mbox{ ha }(x,y)=(0,0)\\</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">\frac{}{(x^2+y^2)^2},& \mbox{ ha }(x,y)\ne(0,0)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">0\end{cases}</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>\partial_{1}(\partial_{1}f)(0,0)=\lim\limits_{x\to x_0}\frac{klkj}{asdsa}</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></math></ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><!--</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><!--</div></td></tr>
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Mozo
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Mozo, 2017. február 19., 19:31-n
2017-02-19T19:31:58Z
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<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:31-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">223. sor:</td>
<td colspan="2" class="diff-lineno">223. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>--></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>--></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">==Lineáris és affin függvény deriváltja==</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">'''Tétel.''' Az ''A'' : '''R'''<sup>n</sup> <math>\to</math> '''R'''<sup>m</sup> lineáris leképezés differenciálható és differenciálja minden pontban saját maga:</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathrm{d}\mathcal{A}(u)=\mathcal{A}\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">''Ugyanis, '' legyen ''u'' &isin;  '''R'''<sup>n</sup>. Ekkor </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\lim\limits_{x\to u}\frac{\mathcal{A}(x)-\mathcal{A}(u)-\mathcal{A}(x-u)}{||x-u||}=\lim\limits_{x\to u}0=0</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">'''Tétel.''' Az azonosan '''c''' konstans függény esetén az d''c''(''u'') <math>\equiv</math> 0 alkalmas differenciálnak, mert</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\lim\limits_{x\to u}\frac{c-c-0\cdot(x-u)}{||x-u||}=\lim\limits_{x\to u}0=0</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">'''Tétel.''' Ha ''f'' és ''g'' a ''H'' &sube; '''R'''<sup>n</sup> halmazon értelmezett '''R'''<sup>m</sup>-be képező, az ''u'' &isin; ''H''-ban differenciálható függvények, akkor minden &lambda; számra</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\lambda.f\,</math>  is differenciálható ''u''-ban és <math>\mathrm{d}(\lambda.f)(u)=\lambda.\mathrm{d}f(u)\,</math> és </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>f+g\,</math> is differenciálható ''u''-ban és <math>\mathrm{d}(f+g)(u)=\mathrm{d}f(u)+\mathrm{d}g(u)\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">''Ugyanis,'' a mondott differenciálokkal és a</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\varepsilon_{\lambda.f}=\lambda.\varepsilon_{f}\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\varepsilon_{f+g}=\varepsilon_{f}+\varepsilon_{g}\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">választással, ezek az ''u''-ban folytonosak lesznek és a lineáris résszekel együtt ezek előállítják a skalárszoros és összegfüggvények megváltozásait.</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">'''Következmény.''' Tehát minden ''u'' &isin; '''R'''<sup>n</sup>-re az '''affin''' c+''A'' diffható és </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathrm{d}(c+\mathcal{A})(u)=\mathcal{A}</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">===Példa===</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Az ''A'': '''x''' <math>\mapsto</math> 2<math>x_1</math> + 3<math>x_2</math> - 4<math>x_3</math> lineáris leképezés differenciálja az '''u''' pontban az '''u'''-tól független</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>(\mathrm{d}\mathcal{A}(\mathbf{u}))(x_1,x_2,x_3)=2x_1+3x_2-4x_3\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">és Jacobi-mátrixa a konstans</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathbf{J}^\mathcal{A}(\mathbf{u})=\begin{bmatrix}2 & 3 & -4\end{bmatrix}</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">mátrix.</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Világos, hogy a </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathrm{pr}_i:(x_1,x_2,...,x_i,...,x_n)\mapsto x_i</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">koordináta vagy projekciófüggvény lineáris, differenciálja minden '''u''' pontban saját maga és ennek mátrixa: </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>[\mathrm{grad}\,\mathrm{pr_i}]=\mathbf{J}^{\mathrm{pr}_i}(\mathbf{u})=\begin{bmatrix}0 & 0 & ... & 1 & ...& 0\end{bmatrix}</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">ahol az 1 az i-edik helyen áll. Másként </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\partial_kx_i=\delta_{ki}</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">ahol </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\delta_{ij}=\left\{\begin{matrix}1, \mbox{ ha }i=j\\0, \mbox{ ha }i\ne j \end{matrix}\right.</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">azaz a Kronecker-féle &delta; szimbólum.</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><center></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><center></div></td></tr>
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Mozo
http://wiki.math.bme.hu/index.php?title=Matematika_A2a_2008/3._gyakorlat&diff=12510&oldid=prev
Mozo: /* Egyváltozós illetve valós értékű függvény deriváltja */
2017-02-19T19:30:24Z
<p><span class="autocomment">Egyváltozós illetve valós értékű függvény deriváltja</span></p>
<table class='diff diff-contentalign-left'>
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<col class='diff-marker' />
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<td colspan='2' style="background-color: white; color:black;">←Régebbi változat</td>
<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:30-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">223. sor:</td>
<td colspan="2" class="diff-lineno">223. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>--></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>--></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">==Egyváltozós illetve valós értékű függvény deriváltja==</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Ha f:'''R'''<sup>n</sup> <math>\supset\!\to</math> '''R''', akkor a definíciót még így is ki szokás mondani:</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">f diffható ''r''<sub>0</sub>-ban, ha létezik ''m'' vektor, hogy </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\lim\limits_{r\to r_0}\frac{f(r)-f(r_0)-m\cdot(r-r_0)}{|r-r_0|}=0</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Ekkor az m a '''gradiensvektor''', melynek sztenderd bázisbeli koordinátamátrixa a Jacobi mátrix:</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathrm{grad}\,f(r_0)=[\partial_1f(r_0),...,\partial_nf(r_0)]</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Ha f:'''R''' <math>\supset\!\to</math> '''R'''<sup>n</sup>, akkor a definíciót még így is ki szokás mondani:</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\exists\,f'(t_0)=\lim\limits_{t\to t_0}\frac{f(t)-f(t_0)}{t-t_0}\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">és ekkor f'(<math>t_0</math>) a <math>t_0</math>-beli '''deriváltvektor''' (ha t az idő és r=f(t) a hely, akkor ez a sebeségvektor).</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Ha f:'''R'''<sup>n</sup> <math>\supset\!\to</math> '''R'''<sup>n</sup>, akkor a differenciált '''deriválttenzor'''nak is nevezik.</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">'''Példa.'''</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Mi az </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>f(r)=r^2\,</math>,</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">skalárfüggvény gradiense?</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Válasszuk le a lineáris részét!</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>r^2-r_0^2=(r-r_0)(r+r_0)=(r-r_0)(2r_0+r-r_0)=2r_0\cdot(r-r_0)+(r-r_0)^2\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">Itt az első tag a lineáris, a második a magasabbfokú. Tehát:</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathrm{grad}\,r^2=2r\,</math></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Lineáris és affin függvény deriváltja==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Lineáris és affin függvény deriváltja==</div></td></tr>
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Mozo
http://wiki.math.bme.hu/index.php?title=Matematika_A2a_2008/3._gyakorlat&diff=12509&oldid=prev
Mozo: /* Folytonos parciális differenciálhatóság */
2017-02-19T19:29:46Z
<p><span class="autocomment">Folytonos parciális differenciálhatóság</span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black;">←Régebbi változat</td>
<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:29-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">173. sor:</td>
<td colspan="2" class="diff-lineno">173. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Világos, hogy a parciális deriváltak folytonossága szükséges a fenti tételben. Az alábbi példában léteznek a parciális deriváltfüggvények az ''u'' egy környzetében, de az ''u''-ban nem folytonosak.  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Világos, hogy a parciális deriváltak folytonossága szükséges a fenti tételben. Az alábbi példában léteznek a parciális deriváltfüggvények az ''u'' egy környzetében, de az ''u''-ban nem folytonosak.  </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">===Példa===</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">A differenciálhatóság azonban nem elég ahhoz, hogy a parciális deriváltak folytonosak legyenek.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Az </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>f(x,y)=\left\{\begin{matrix}(x^2+y^2)\sin\cfrac{1}{x^2+y^2}, & \mbox{ha} & (x,y)\ne (0,0)\\\\</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">0, & \mbox{ha} & (x,y) =(0,0)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">\end{matrix}\right.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">differenciálható, hiszen ez az </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>f(\mathbf{r})=\left\{\begin{matrix} \mathbf{r}^2\cdot\sin(|\mathbf{r}|^{-2}) & \mbox{ha} & \mathbf{r}\ne \mathbf{0}\\\\</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">\mathbf{0}, & \mbox{ha} & \mathbf{r}= \mathbf{0}\end{matrix}\right.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">függvény és '''r''' &ne; '''0'''-ban:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>\mathrm{grad}(f)=\sin(|\mathbf{r}|^{-2}).\mathrm{grad}\,\mathbf{r}^2+\mathbf{r}^2.\mathrm{grad}\,\sin(|\mathbf{r}|^{-2})=</math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">:<math>=\sin(|\mathbf{r}|^{-2}).2\mathbf{r}+\mathbf{r}^2\cdot\cos(|\mathbf{r}|^{-2})\cdot(-2)|\mathbf{r}|^{-3}.\frac{\mathbf{r}}{|\mathbf{r}|}</math></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Példa===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Példa===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td colspan="2" class="diff-lineno">179. sor:</td>
<td colspan="2" class="diff-lineno">197. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>\frac{xy(x^2-y^2)}{x^2+y^2},& \mbox{ ha }(x,y)\ne(0,0)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>\frac{xy(x^2-y^2)}{x^2+y^2},& \mbox{ ha }(x,y)\ne(0,0)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>\end{matrix}\right.</math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>\end{matrix}\right.</math></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">A Young-tételnél beláttuk</del>, hogy <del class="diffchange diffchange-inline">ekkor </del>a <del class="diffchange diffchange-inline">0-ban nem egyenlő a két vegyes parciális derivált. Most már azt is tudjuk miért. A </del>függvény <del class="diffchange diffchange-inline">gradiense nem differenciálható </del>totálisan a 0-ban<del class="diffchange diffchange-inline">. Ehhez elevenítsük föl, hogy </del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">1) Polárkoordinátásan könnyen kijön</ins>, hogy <ins class="diffchange diffchange-inline">ez </ins>a függvény totálisan <ins class="diffchange diffchange-inline">deriválható. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">2) Melyek a parciális deriváltjai és azok deriváltjai </ins>a 0-ban<ins class="diffchange diffchange-inline">?</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline"><!--</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>J^g(0,0)=H^f(0,0)=\begin{bmatrix}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>J^g(0,0)=H^f(0,0)=\begin{bmatrix}</div></td></tr>
<tr><td colspan="2" class="diff-lineno">198. sor:</td>
<td colspan="2" class="diff-lineno">222. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>\lim\limits_{t\to 0}\frac{g(t,t)-g(0,0)-J^g(0,0)\cdot (t,t)}{|t|}=\lim\limits_{t\to 0}\frac{(t,-t)-(-t,t)}{|t|}=\lim\limits_{t\to 0}\frac{(2t,-2t)}{|t|}=\lim\limits_{t\to 0}(2\mathrm{sgn}(t),-2\mathrm{sgn}(t))\ne (0,0)\,</math></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>\lim\limits_{t\to 0}\frac{g(t,t)-g(0,0)-J^g(0,0)\cdot (t,t)}{|t|}=\lim\limits_{t\to 0}\frac{(t,-t)-(-t,t)}{|t|}=\lim\limits_{t\to 0}\frac{(2t,-2t)}{|t|}=\lim\limits_{t\to 0}(2\mathrm{sgn}(t),-2\mathrm{sgn}(t))\ne (0,0)\,</math></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>--></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">====Példa====</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">A differenciálhatóság azonban nem elég ahhoz, hogy a parciális deriváltak folytonosak legyenek.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Az </del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">:<math>f(x,y)=\left\{\begin{matrix}(x^2+y^2)\sin\cfrac{1}{x^2+y^2}, & \mbox{ha} & (x,y)\ne (0,0)\\\\</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">0, & \mbox{ha} & (x,y) =(0,0)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">\end{matrix}\right.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"></math></del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">differenciálható, hiszen ez az </del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">:<math>f(\mathbf{r})=\left\{\begin{matrix} \mathbf{r}^2\cdot\sin(|\mathbf{r}|^{-2}) & \mbox{ha} & \mathbf{r}\ne \mathbf{0}\\\\</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">\mathbf{0}, & \mbox{ha} & \mathbf{r}= \mathbf{0}\end{matrix}\right.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"></math></del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">függvény és '''r''' &ne; '''0'''-ban:</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">:<math>\mathrm{grad}(f)=\sin(|\mathbf{r}|^{-2}).\mathrm{grad}\,\mathbf{r}^2+\mathbf{r}^2.\mathrm{grad}\,\sin(|\mathbf{r}|^{-2})=</math></del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">:<math>=\sin(|\mathbf{r}|^{-2}).2\mathbf{r}+\mathbf{r}^2\cdot\cos(|\mathbf{r}|^{-2})\cdot(</del>-<del class="diffchange diffchange-inline">2)|\mathbf{r}|^{</del>-<del class="diffchange diffchange-inline">3}.\frac{\mathbf{r}}{|\mathbf{r}|}</math</del>></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">és grad f nem korlátos. Ez persze a parciális deriváltakon is megátszik: azok sem korlátosak.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Egyváltozós illetve valós értékű függvény deriváltja==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Egyváltozós illetve valós értékű függvény deriváltja==</div></td></tr>
</table>
Mozo
http://wiki.math.bme.hu/index.php?title=Matematika_A2a_2008/3._gyakorlat&diff=12508&oldid=prev
Mozo: /* Folytonos parciális differenciálhatóság */
2017-02-19T19:17:26Z
<p><span class="autocomment">Folytonos parciális differenciálhatóság</span></p>
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<td colspan='2' style="background-color: white; color:black;">←Régebbi változat</td>
<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:17-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">173. sor:</td>
<td colspan="2" class="diff-lineno">173. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Világos, hogy a parciális deriváltak folytonossága szükséges a fenti tételben. Az alábbi példában léteznek a parciális deriváltfüggvények az ''u'' egy környzetében, de az ''u''-ban nem folytonosak.  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Világos, hogy a parciális deriváltak folytonossága szükséges a fenti tételben. Az alábbi példában léteznek a parciális deriváltfüggvények az ''u'' egy környzetében, de az ''u''-ban nem folytonosak.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>====<del class="diffchange diffchange-inline">Nem differenciálható, nem folytonosan parciálisan differenciálható függvény</del>==<del class="diffchange diffchange-inline">==</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>===<ins class="diffchange diffchange-inline">Példa</ins>===</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">:<math>f(x,y)=\left\{\begin{matrix}\frac{xy}{\sqrt{x^2+y^2}}& \mbox{, ha }&(x,y)\ne (0,0)\\</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">0&\mbox{, ha }&(x,y)=(0,0)\end{matrix}\right.</math> </del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">parciális deriváltfüggvényei léteznek:</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">:<math>\frac{\partial f(x,y)}{\partial x}=\frac{y}{\sqrt{x^2+y^2}}-\frac{x^2y}{\sqrt{(x^2+y^2)^3}}</math></del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">a másik hasonlóan. A 0-ban 0 mindkettő, de az (0,1/n) mentén a 0-ba tartva az 1-hez tart, ami nem 0.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>f(x,y)=\left\{\begin{matrix}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:<math>f(x,y)=\left\{\begin{matrix}</div></td></tr>
<tr><td colspan="2" class="diff-lineno">205. sor:</td>
<td colspan="2" class="diff-lineno">199. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>márpedig ha g minden parciális deriváltja folytonos lenne a (0,0)-ban, akkor g totálisan is deriválható lenne.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>====<del class="diffchange diffchange-inline">Differenciálható, de nem folytonosan parciálisan differenciálható</del>====</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>====<ins class="diffchange diffchange-inline">Példa</ins>====</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A differenciálhatóság azonban nem elég ahhoz, hogy a parciális deriváltak folytonosak legyenek.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A differenciálhatóság azonban nem elég ahhoz, hogy a parciális deriváltak folytonosak legyenek.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
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Mozo
http://wiki.math.bme.hu/index.php?title=Matematika_A2a_2008/3._gyakorlat&diff=12507&oldid=prev
Mozo: /* Parciális differenciálhatóság és differenciálhatóság */
2017-02-19T19:14:17Z
<p><span class="autocomment">Parciális differenciálhatóság és differenciálhatóság</span></p>
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<td colspan='2' style="background-color: white; color:black;">←Régebbi változat</td>
<td colspan='2' style="background-color: white; color:black;">A lap 2017. február 19., 19:14-kori változata</td>
</tr><tr><td colspan="2" class="diff-lineno">131. sor:</td>
<td colspan="2" class="diff-lineno">131. sor:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Persze g nem folytonos, és így nem is lehet totálisan differenciálható.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Persze g nem folytonos, és így nem is lehet totálisan differenciálható.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">'''Példa.''' <math>f(x,y)=\sqrt[3]{x^4+y^4}</math></ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Iránymenti deriválhatóság és differenciálhatóság===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Iránymenti deriválhatóság és differenciálhatóság===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Ha e tetszőleges egységvektor, akkor  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Ha e tetszőleges egységvektor, akkor  </div></td></tr>
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Mozo