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Gh. Soleimani reacted to Mark44's post in the thread A How to Find Critical Points of function f(x,y,z) with
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##|H| = \begin{vmatrix} 0&1&0 \\1&0&-1 \\0 & 1& 0\end{vmatrix}## does not depend on the values of x, y, or z. What do you get for |H|...