fact: Variable n m: nat.
imports: Coq(List) ATBR(Common) ATBR(Classes) ATBR(Graph) ATBR(Monoid) ATBR(SemiLattice) ATBR(SemiRing) ATBR(KleeneAlgebra) ATBR(MxGraph) ATBR(MxSemiLattice) ATBR(MxSemiRing) ATBR(MxKleeneAlgebra) ATBR(Functors) ATBR(MxFunctors) ATBR(DKA_Definitions) ATBR(Model_Languages)