I would like to know when $\frac{f(x,y,z,w)}{g(x,y,z,w)}$ would be convex. I know that both $f$ and $g$ being convex is not sufficient. Is there any theorem or reference that I can look at?
2026-03-25 23:38:11.1774481891
Conditions for ratio of convex functions to be convex
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