proposition: Theorem Book_1_1_refl : forall (A B C D : Type) (f : A -> B) (g : B -> C) (h : C -> D), h o (g o f) = (h o g) o f.
proof: Proof. reflexivity. Defined.
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)