`BookProof.ChapterAbelianDiagonalCountable.diagOp_mul` (d e : EllInf) : diagOp (d * e) = (diagOp d).comp (diagOp e)

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`BookProof.ChapterAbelianDiagonalCountable.diagOp_mul` (d e : EllInf) : diagOp (d * e) = (diagOp d).comp (diagOp e) · Prove2Me