Principles of Quantum Mechanics · Problem 1.3.3

Mathematical Introduction — R. Shankar

Physics — Quantum Mechanics · schwarz-inequality

Problem

When will equality hold in the Schwarz inequality ∣⟨V∣W⟩∣≤∣V∣∣W∣|\langle V|W\rangle| \leq |V||W|? Does this agree with your experience with arrows?

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