%%The wikipedia article for this topic is terrible. It practically cites no sources and the one source it cites is pg 143 from Weinbergs textbook on quantum field theory. it seems irrelevant. See references to 'Operator ordering ambiguities' in woit's text.%% # Time ordering ([... see more](Time%20ordering.md)) # Normal ordering ([... see more](Normal%20ordering.md)) #QuantumMechanics/MultiParticleQuantumSystems #QuantumMechanics/QuantumFieldTheory