fact: Definition is_qinv {A B : Type} (f : A -> B) := { g : B -> A & ((f o g == idmap) * (g o f == idmap))%type }.
imports: HoTT(Basics Types HProp HSet Projective TruncType Truncations Modalities.Notnot Modalities.Open Modalities.Closed BoundedSearch Equiv.BiInv Spaces.Nat Spaces.Torus.TorusEquivCircles Metatheory.Core Metatheory.FunextVarieties)