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Results tagged with convex-analysis
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user 144000
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Concavity of a function along a path
Suppose that $f(x,y)$ is a continuously differentiable function
and $g(x,y) =xy-f(x,y)$. I know that $g$ is concave
if and only if $(-f_{xx})(-f_{yy}) -(1-f_{xy}) ^{2}>0$ and $f_{xx}>0$.
Now suppose …
- 1