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What is the name of this determinant or matrix?

$$\begin{vmatrix} f_{xx} & f_{xy} \\ f_{yx} & f_{yy} \end{vmatrix}$$

Anything further explanation is greatly appreciated!

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    $\begingroup$ That's the Hessian matrix. $\endgroup$ Commented Apr 24, 2020 at 1:49

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This is the Hessian matrix and it is used in determining the shape of a 2-dimensional function. https://en.m.wikipedia.org/wiki/Hessian_matrix

Stay safe

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