subsection ‹Class Instances for Multivariate Polynomials and Containers› theory MPoly_Container imports "Polynomials.MPoly_Type_Class" "Containers.Set_Impl" begin text ‹Basic setup for using multivariate polynomials in combination with container framework.› derive (eq) ceq poly_mapping derive (dlist) set_impl poly_mapping (* difference list *) derive (no) ccompare poly_mapping (* no order on poly-mapping *) end