`BookProof.ChapterA.realCommutes_neg` {M : System ℂ V} {S : V →L[ℝ] V} (hS : RealCommutes M S) : RealCommutes M (-S)

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`BookProof.ChapterA.realCommutes_neg` {M : System ℂ V} {S : V →L[ℝ] V} (hS : RealCommutes M S) : RealCommutes M (-S) · Prove2Me