Equivariant Gr\"obner bases of symmetric toric ideals

Abstract

It has been shown previously that a large class of monomial maps equivariant under the action of an infinite symmetric group have finitely generated kernels up to the symmetric action. We prove that these symmetric toric ideals also have finite Gr\"obner bases up to symmetry for certain monomial orders. An algorithm is presented for computing equivariant Gr\"obner bases that terminates whenever a finite basis exists, improving on previous algorithms that only guaranteed termination in rings Noetherian up to symmetry. This algorithm can be used to compute equivariant Gr\"obner bases of the above toric ideals, given the monomial map.