Poincaré algebra

Layer 1 — Physicsin the Relativistic Field Theory subtree

[P_μ, P_ν] = 0, [M_μν, P_ρ] = i(η_νρ P_μ - η_μρ P_ν), [M,M]~M; Casimirs P² = m², W² = -m²s(s+1).

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