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Nonlinear objectives, nonlinear constraints, non-convex objective, non-convex feasible region.

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Sum of absolute values of trigonometric polynomials

I am trying to tackle the following problem: Let $A_{f},A_{g} \in \mathbb{R}^{3 \times 3}$ be symmetric matrices and let $f: [-\pi,\pi)^{2} \to \mathbb{R}$ and $g: [-\pi,\pi)^{2} \to \mathbb{R}$ tha …
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