`BookProof.ChapterAbelianDiagonalCountable.vonNeumann_abelian_class_countable` : Function.Injective diagOp ∧ (∀ d e : EllInf, (diagOp d).comp (diagOp e) = (diagOp e).comp (diagOp d

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`BookProof.ChapterAbelianDiagonalCountable.vonNeumann_abelian_class_countable` : Function.Injective diagOp ∧ (∀ d e : EllInf, (diagOp d).comp (diagOp e) = (diagOp e).comp (diagOp d · Prove2Me