fact: Definition set_of_der_star (E:regexp) : gset regexp := fun G => exists e, exists l, (set_of_der E) e /\ gpred_list (set_of_der E) l /\ similar G (rPlus2 (Conc e (Star E)) (Star E) l).
imports: Coq(RelationClasses Setoid Morphisms Permutation) Coq(SetoidList Mergesort Orders) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype) mathcomp(bigop path) RegLang(languages) RegexpBrzozowski(glue gfinset regexp)