proposition: Lemma valid_index_mono : isMono valid_index.
proof: Proof. repeat intro. destruct Fm. destruct H. exists x0 ; split ; auto. eapply has_form_mono ; eauto. Qed.
imports: Cdcl.PatriciaR Cdcl.KeyInt Cdcl.ReifClasses Cdcl.Lib Bool Setoid ZifyBool ZArith Uint63 Lia List Cdcl.Syntax Cdcl.Clause