fact: Definition abgr_image_hsubtype {A B : abgr} (f : monoidfun A B) : hsubtype B := (λ y : B, ∃ x : A, (f x) = y).
imports: UniMath.MoreFoundations.Orders UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.Subtypes UniMath.Algebra.BinaryOperations UniMath.Algebra.Monoids