fact: Fixpoint nf_b (alpha : T1) : bool := match alpha with | zero => true | cons a n zero => nf_b a | cons a n ((cons a' n' b') as b) => (nf_b a && nf_b b && (bool_decide (lt a' a)))%bool end.
imports: Coq(Arith Max Bool Lia Compare_dec Relations Ensembles Wellfounded Bool RelationClasses Operators_Properties ArithRing Logic.Eqdep_dec) hydras(More_Arith Restriction DecPreOrder) hydras(OrdNotations)