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Second Derivative Test Discriminant

D=f_(xx)f_(yy)-f_(xy)f_(yx)
(1)
=f_(xx)f_(yy)-f_(xy)^2,
(2)

where f_(ij) are partial derivatives.

See also

Second Derivative Test

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Cite this as:

Weisstein, Eric W. "Second Derivative Test Discriminant." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SecondDerivativeTestDiscriminant.html

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