fact: Definition Book_2_1_concatenation1_eq_Book_2_1_concatenation4 : forall {A : Type} {x y z : A} (p : x = y) (q : y = z), (p *1 q = p *4 q).
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)