Stupid thing I noticed today:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\nabla^2 U=tr(H(U))[/tex]

Or, in other words, the Laplacian of a function is just the trace of its Hessian matrix. Whoop-de-frickin do, right? Is this useful knowledge or should I forget it immediately?

N!

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# Laplacian = tr(H)

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