`BookProof.ChapterGravityIrrep.trace_symTracelessPart` (M : Matrix (Fin 3) (Fin 3) ℝ) : (symTracelessPart M).trace = 0

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`BookProof.ChapterGravityIrrep.trace_symTracelessPart` (M : Matrix (Fin 3) (Fin 3) ℝ) : (symTracelessPart M).trace = 0 · Prove2Me