fact: Definition Quotient_functor {A : Type} (R : Relation A) {B : Type} (S : Relation B) (f : A -> B) (fresp : forall x y, R x y -> S (f x) (f y)) : Quotient R -> Quotient S.
imports: Basics Types HSet TruncType Colimits.GraphQuotient Truncations.Core PropResizing