DLMF:1.5.E21 (Q144): Difference between revisions

Revision as of 15:54, 1 January 2020

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Language	Label	Description	Also known as
English	DLMF:1.5.E21	No description defined

{\displaystyle{\displaystyle\frac{{\partial}^{2}f}{{\partial x}^{2}}\frac{{% \partial}^{2}f}{{\partial y}^{2}}-\left(\frac{{\partial}^{2}f}{\partial x% \partial y}\right)^{2}>0\quad\mbox{ at $(a,b)$}.}}

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DLMF:1.5.E21

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{\displaystyle{\displaystyle(\NVar{a},\NVar{b})}}

introduction.Sx4.p1.t1.r29.m6acdec

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{\displaystyle{\displaystyle\frac{\partial\NVar{f}}{\partial\NVar{x}}}}

C1.S5.E3.m4andec

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@@ Property / Symbols used @@
+partial derivative of $$f$$  with respect to  $$x$$
+Normal rank
+Defining formula:  ${\displaystyle{\displaystyle\frac{\partial\NVar{f}}{\partial\NVar{x}}}}$ 
\pderiv{\NVar{f}}{\NVar{x}}
+xml-id: C1.S5.E3.m4andec