fact: Definition ext_equiv `{Equiv A} `{Equiv B} : Equiv (A → B) := ((=) ==> (=))%signature.
imports: MathClasses.theory.CoqStreams Coq.Classes.Morphisms Coq.Setoids.Setoid Coq.Program.Program Coq.Unicode.Utf8 Coq.Unicode.Utf8_core MathClasses.misc.stdlib_hints