Quantum Mechanics: Concepts and Applications · Problem 2.7

Mathematical Tools of Quantum Mechanics — Nouredine Zettili

Physics — Quantum Mechanics · projection-operators

Problem

Show that the operator ∣ψ⟩⟨ψ∣|\psi\rangle\langle\psi| is a projection operator only when ∣ψ⟩|\psi\rangle is normalized.

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