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La funksjonen $f:X\\subseteq\\mathbb{R}^2\\rightarrow\\mathbb{R}$ være deriverbar i $\\mathbf{a}$.

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La $f_x(\\mathbf{a})=f_y(\\mathbf{a})=0$ og $A=f_{xx}(\\mathbf{a})$, $B=f_{xy}(\\mathbf{a})$, $C=f_{yy}(\\mathbf{a})$.

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Velg matchende påstander

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