proposition: Proposition Book_1_3_sig_refl : forall C g a b, sig_ind_eta C g (a; b) = g a b.
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)