Veronese transform and Castelnuovo-Mumford regularity of modules

Authors: MARCEL MORALES, NGUYEN THI DUNG

Abstract: Veronese rings, Segre embeddings, or more generally Segre--Veronese embeddings are very important rings in algebraic geometry. In this paper we present an original, elementary way to compute the Hilbert--Poincar\'e series of these rings; as a consequence we compute their Castelnuovo--Mumford regularity and also the highest graded Betti number. Moreover, using the Castelnuovo--Mumford regularity of a Cohen--Macaulay finitely generated graded module, we compute that of its Veronese transforms.

Keywords: Castelnuovo-Mumford regularity, Veronese ring, Segre ring, Hilbert Series

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