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May 20, 2018 at 19:54 comment added Davis Yoshida @rbird The determinant alone can't tell you for three variables because a positive determinant could mean one positive and two negative eigenvalues (saddle point) or all positive (local minimum)
S May 20, 2018 at 17:00 history suggested emma CC BY-SA 4.0
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May 20, 2018 at 16:27 comment added NicNic8 That Wikipedia article claims that the determinant test only works with functions of two variables.
May 20, 2018 at 16:26 answer added peterh timeline score: 3
May 20, 2018 at 16:23 answer added NicNic8 timeline score: 3
May 20, 2018 at 16:21 review Suggested edits
S May 20, 2018 at 17:00
May 20, 2018 at 16:19 history asked MathWannaBe CC BY-SA 4.0