fact: Definition sigT_equiv `{Equiv A} (P: A → Type) : Equiv (sigT P) := λ a b, projT1 a = projT1 b.
imports: MathClasses.theory.CoqStreams Coq.Classes.Morphisms Coq.Setoids.Setoid Coq.Program.Program Coq.Unicode.Utf8 Coq.Unicode.Utf8_core MathClasses.misc.stdlib_hints