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v2010.10.26 - Convex Optimization

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7.2. SECOND PREVALENT PROBLEM: 571rankXgcenv rankXFigure 154: Abstraction of convex envelope of rank function. Rank is aquasiconcave function on positive semidefinite cone, but its convex envelopeis the largest convex function whose epigraph contains it. Vertical barlabelled g measures a trace/rank gap; id est, rank found always exceedsestimate; large decline in trace required here for only small decrease in rank.

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