fact: Definition retract_is_int_to_ring : IntegersToRing Z2 := fun Z2 _ _ _ _ _ _ => integers_to_ring Z Z2 ∘ f^-1.
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