fact: Fixpoint set_of_variables_list (l : list term) : VSet.t := match l with | nil => VSet.empty | t :: lt => VSet.union (set_of_variables t) (set_of_variables_list lt) end.
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)