fact: Definition Rquo x y := exists r, SCC'_tag r = Some x /\ exists s, SCC'_tag s = Some y /\ R r s.
imports: Coq(Permutation Multiset Heap PermutSetoid) CoLoR(AdjMat RelUtil ListExtras LogicUtil VecUtil NatUtil RelSub Path SortUtil ListNodup OptUtil BoundNat SCC SCC_dec Total)