fact: Definition gpred_list (E: gset A ) : gset (seq A) := fix aux l : Prop := match l with | [::] => True | x :: xs => E x /\ aux xs end.
imports: Coq(RelationClasses Setoid Morphisms SetoidList Mergesort Permutation) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype) mathcomp(bigop path) RegexpBrzozowski(glue)