fact: Definition retract_is_nat_to_sr : NaturalsToSemiRing SR := fun R _ _ _ _ _ => naturals_to_semiring N R ∘ f^-1.
imports: HoTT.Basics.Decidable HoTT.Classes.interfaces.orders HoTT.Classes.implementations.peano_naturals HoTT.Classes.theory.rings HoTT.Classes.isomorphisms.rings HoTT.Classes.interfaces.naturals