proposition: Lemma functor_xif `{HF: graph_functor} : forall A B b (x y: X A B), F A B (xif b x y) == xif b (F A B x) (F A B y).
proof: Proof. intros. destruct b; reflexivity. Qed.
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)