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`BookProof.ChapterGaugeShiftExample.expectation_shift_invariant` {A : L2Z →L[ℂ] L2Z} (hA : ∀ m : ℤ, A * shiftOp m = shiftOp m * A) (m : ℤ) (f : L2Z) : ⟪shiftOp m f, A (shiftOp m f) · Prove2Me