fact: Definition qglue@{i j k} {A : Type@{i}} {R : Relation@{i j} A} {x y : A} : R x y -> class_of@{i j k} R x = class_of R y := fun p => ap tr (gqglue p).
imports: Basics Types HSet TruncType Colimits.GraphQuotient Truncations.Core PropResizing