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v2009.01.01 - Convex Optimization

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506 CHAPTER 7. PROXIMITY PROBLEMS<br />

7.1.2 Generic problem<br />

Prior to determination of D ⋆ , analytical solution (1221) to Problem 1 is<br />

equivalent to solution of a generic rank-constrained projection problem:<br />

Given desired affine dimension ρ and<br />

A ∆ = −V T NHV N =<br />

N−1<br />

∑<br />

i=1<br />

λ i v i v T i ∈ S N−1 (1222)<br />

Euclidean projection on a rank ρ subset of a PSD cone (on a generally<br />

nonconvex subset of the PSD cone boundary ∂S N−1<br />

+ when ρ

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