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Revision as of 22:31, 20 June 2008
, 22:31, 20 June 2008revert last edit
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<math>\begin{matrix}
<p><math>\operatorname{d}f = </math></p>
\operatorname{d}f = \\
<p><math>\partial_x f \cdot \operatorname{d}x\ +\ \partial_y f \cdot \operatorname{d}y</math></p>
\partial_x f \cdot \operatorname{d}x\ +\ \partial_y f \cdot \operatorname{d}y \\
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<math>\begin{matrix}
<p><math>\operatorname{d}^2 f = </math></p>
\operatorname{d}^2 f = \\
<p><math>\partial_{xy} f \cdot \operatorname{d}x\ \operatorname{d}y</math></p>
\partial_{xy} f \cdot \operatorname{d}x\ \operatorname{d}y \\
| <math>\operatorname{d}f|_{x\ y}\!</math>
| <math>\operatorname{d}f|_{x\ y}\!</math>
| <math>\operatorname{d}f|_{x\ (y)}\!</math>
| <math>\operatorname{d}f|_{x\ (y)}\!</math>
