fact: Definition lt_ge_dec : forall x y, {x < y} + {x >= y} := fun n m => Sumbool.sumbool_not _ _ (le_lt_dec m n).
imports: Coq(Arith Wf_nat Wellfounded List Multiset Relations) CoLoR(closure decidable_set ordered_set more_list list_permut list_set list_sort dickson term_spec term)