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Why hexagons? The maximal minimum of a sum of cosines on the plane with frequencies on the unit circle
We wish to maximize the minimum of a weighted sum of cosines in the plane, when the frequency components are on the unit circle. Formally:
$$\max_{\{ a_i,\theta_i,\phi_i \}_{i=1}^{N} } \min_{(x,y) \...
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