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Discriminant (Second Derivative Test)


\begin{displaymath}
D \equiv f_{xx}f_{yy}-f_{xy}f_{yx} = f_{xx}f_{yy}-{f_{xy}}^2,
\end{displaymath}

where $f_{ij}$ are Partial Derivatives.

See also Second Derivative Test




© 1996-9 Eric W. Weisstein
1999-05-24