DLMF:1.5.E20 (Q143)

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DLMF:1.5.E20
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    test
    ∂ 2 ⁡ f ∂ ⁡ x 2 > 0 ⁢ ( < 0 )    at  ( a , b ) , partial-derivative 𝑓 𝑥 2 0 absent 0  at  ( a , b ) , {\displaystyle{\displaystyle\frac{{\partial}^{2}f}{{\partial x}^{2}}>0\;\;\;% \mbox{$(<0)$}\quad\mbox{ at $(a,b)$,}}}
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    DLMF:1.5.E20
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