Commutator of local fields at space-like-separated points vanishes: [φ(x), φ(y)] = 0 for (x−y)² < 0. Codifies relativistic causality at the quantum level.
Commutator of local fields at space-like-separated points vanishes: [φ(x), φ(y)] = 0 for (x−y)² < 0. Codifies relativistic causality at the quantum level.