fact: Definition delta2 (efw:bregexp * bregexp * bword) := let (ef,_) := efw in let (e,f) := ef in has_eps e == has_eps f.
imports: Coq(RelationClasses) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype) mathcomp(bigop path) RegLang(languages) RegexpBrzozowski(glue gfinset regexp finite_der)