On the dimensions of secant varieties of Segre-Veronese varieties

Details On the dimensions of secant varieties of Segre-Veronese varieties On the dimensions of secant varieties of Segre-Veronese varieties

2009-12-22

arxiv.org/abs/0912.4342v2

Mathematics

Algebraic Geometry

Revised version. To appear in Annali di Matematica Pura e Applicata

Scientific paper

This paper explores the dimensions of higher secant varieties to Segre-Veronese varieties. The main goal of this paper is to introduce two different inductive techniques. These techniques enable one to reduce the computation of the dimension of the secant variety in a high dimensional case to the computation of the dimensions of secant varieties in low dimensional cases. As an application of these inductive approaches, we will prove non-defectivity of secant varieties of certain two-factor Segre-Veronese varieties. We also use these methods to give a complete classification of defective s-th Segre-Veronese varieties for small s. In the final section, we propose a conjecture about defective two-factor Segre-Veronese varieties.

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