fact: Fixpoint unary (n:nat) : bregexp := match n with | O => (@Eps _) | Datatypes.S p => Conc (unary p) F end.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype) mathcomp(bigop path) RegexpBrzozowski(glue gfinset regexp finite_der equiv) RegexpBrzozowski(sim1 sim2)