`BookProof.ChapterGravityPolymomentum.trace_metric_mul_of_antisymm` {M : Matrix (Fin 4) (Fin 4) ℝ} (hM : Mᵀ = -M) : (metric * M).trace = 0

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`BookProof.ChapterGravityPolymomentum.trace_metric_mul_of_antisymm` {M : Matrix (Fin 4) (Fin 4) ℝ} (hM : Mᵀ = -M) : (metric * M).trace = 0 · Prove2Me