`BookProof.ChapterGaugeUnconstrainedSpectrum.diagOp_mul_comm` (d e : X → ℂ) : diagOp d ∘ₗ diagOp e = diagOp e ∘ₗ diagOp d

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`BookProof.ChapterGaugeUnconstrainedSpectrum.diagOp_mul_comm` (d e : X → ℂ) : diagOp d ∘ₗ diagOp e = diagOp e ∘ₗ diagOp d · Prove2Me