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`BookProof.BrstReducedTransfer.transfer_bijective` (hzero : ∀ x : H, U 0 x = x) (hgroup : ∀ (s t : ℝ) (x : H), U s (U t x) = U (s + t) x) (t : ℝ) : Function.Bijective (transfer Om · Prove2Me