proposition: Lemma to_ring_unique `{Integers Z} `{IsRing R} (f: Z -> R) {h: IsSemiRingPreserving f} x : f x = integers_to_ring Z R x.
proof: Proof. symmetry. apply integers_initial. Qed.
imports: HoTT.Basics.Decidable HoTT.Classes.theory.nat_distance HoTT.Classes.implementations.peano_naturals HoTT.Classes.interfaces.naturals HoTT.Classes.interfaces.orders HoTT.Classes.implementations.natpair_integers HoTT.Classes.theory.rings HoTT.Classes.isomorphisms.rings HoTT.Classes.interfaces.integers