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Nonlinear objectives, nonlinear constraints, non-convex objective, non-convex feasible region.
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Can a real quartic polynomial in two variables have more than 4 isolated local minima?
This question: "Can a real quartic polynomial in two variables have at most 4 isolated local minima?" came up in this post on Math SE but with no answer so far.
Finding examples of 4 isolated minima t …