Proof of Theorem 2, p. 46 — U⁰ = Z⁰Diag(1/√n_k) are top-r eigenvectors of X⁰ with eigenvalues n_k, and X⁰ vanishes on their complement

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Proof of Theorem 2, p. 46 — U⁰ = Z⁰Diag(1/√n_k) are top-r eigenvectors of X⁰ with eigenvalues n_k, and X⁰ vanishes on their complement · Prove2Me