`BookProof.ChapterGaugeShiftExample.shiftOp_mul` (m n : ℤ) : shiftOp m * shiftOp n = shiftOp (m + n)

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`BookProof.ChapterGaugeShiftExample.shiftOp_mul` (m n : ℤ) : shiftOp m * shiftOp n = shiftOp (m + n) · Prove2Me