DLMF:1.5.E21 (Q144)

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DLMF:1.5.E21
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    test
    ∂ 2 ⁡ f ∂ ⁡ x 2 ⁢ ∂ 2 ⁡ f ∂ ⁡ y 2 - ( ∂ 2 ⁡ f ∂ ⁡ x ⁢ ∂ ⁡ y ) 2 > 0    at  ( a , b ) . partial-derivative 𝑓 𝑥 2 partial-derivative 𝑓 𝑦 2 superscript 𝑓 2 𝑥 𝑦 2 0  at  ( a , b ) {\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 id
    DLMF:1.5.E21
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