fact: Definition prog R S := forall e f, In (e,f) R -> sup vars (e++f) ≦ I /\ forall a, In a A -> epsilon' a e = epsilon' a f /\ forall i, In i I -> In (pderiv' a i e, pderiv' a i f) S.
imports: lset kat positives sums glang boolean comparisons powerfix ugregex