Shift modules, strongly stable ideals, and their dualities

Abstract

We enrich the setting of strongly stable ideals (SSI): We introduce shift modules, a module category encompassing SSI's. The recently introduced duality on SSI's is given an effective conceptual and computational setting. We study strongly stable ideals in infinite dimensional polynomial rings, where the duality is most natural. Finally a new type of resolution for SSI's is introduced. This is the projective resolution in the category of shift modules.