Principles of Quantum Mechanics · Problem 11.4.1

Rotational Invariance and Angular Momentum — R. Shankar

Physics — Quantum Mechanics · parity-invariance

Problem

Prove that if [Π,H]=0[\Pi, H] = 0, a system that starts out in a state of even parity maintains its parity. (Note that since parity is a discrete operation, it has no associated conservation law in classical mechanics.)

Browse the problem library