proposition: Lemma remove_nonterminal_noninc' {ls nt} : nonterminals_length (remove_nonterminal ls nt) <= nonterminals_length ls.
proof: Proof. apply Nat.nlt_ge. apply remove_nonterminal_noninc. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.Classes.RelationClasses Coq.Setoids.Setoid Coq.ZArith.ZArith Fiat.Parsers.ContextFreeGrammar.Core Fiat.Parsers.BaseTypes