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`BookProof.ChapterF7.i_comm_l2Symmetric` {K V : 𝓒(ℝ, β„‚) β†’L[β„‚] 𝓒(ℝ, β„‚)} (hK : IsL2Symmetric K) (hV : IsL2Symmetric V) : IsL2Symmetric (Complex.I β€’ (K.comp V - V.comp K)) Β· Prove2Me