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Re:13-Year-Old Makes Solar Power Breakthrough by Harnessing ... by uvdiv on Saturday August 20, 2011 @05:07AM (#2906230)
That's not actually sufficient to show unique extrema; there an be a set of points on which a function achieves the same, maximal, value.

i.e. cos(x) over x <- [0,4π] -- multiple maxima at {0,2π,4π}.

But we don't really need unique extrema here. Oversight on my part -- there can be (although I believe there aren't) multiple optimal panel orientations. Then the optimal array is an array with each panel having any one of the optimal orientations.

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