Question: (Duality) Prove the dual result to Proposition 1 that Col(X).] (I-Px)y argmin ly-z||2 zeCol+(X)

(Duality) Prove the dual result to Proposition 1 that (I-Px)y argmin ly-z||2 zeCol+(X)

Col(X).]

(I-Px)y argmin ly-z||2 zeCol+(X)

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