Problem. Prove that for any linear operator φ on there exist a unitary operator θ and a non-negative definite self-adjoint operator σ such that φ=σ∘θ.
Proof.
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Problem. Prove that for any linear operator φ on there exist a unitary operator θ and a non-negative definite self-adjoint operator σ such that φ=σ∘θ.
Proof.
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