Lemma 23.1 (as proved): for every (U, W) there is V with VᵀV = I such that (V, Vᵀ) has PCA objective ≤ that of (U, W)

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Lemma 23.1 (as proved): for every (U, W) there is V with VᵀV = I such that (V, Vᵀ) has PCA objective ≤ that of (U, W) · Prove2Me