proposition: Lemma rng_homo_image_incl {R S} (f : CRingHomomorphism R S) : rng_image f $-> S.
proof: Proof. snrapply Build_CRingHomomorphism. 1: exact pr1. repeat split. Defined.
imports: WildCat Spaces.Nat.Core Classes.interfaces.abstract_algebra Algebra.AbGroups Classes.theory.rings Modalities.ReflectiveSubuniverse