We study entry loci of varieties and their irreducibility from the perspective of X-ranks with respect to a projective variety X. These loci are the closures of the points that appear in an X-rank decomposition of a general point in the ambient space. We look at entry loci of low degree normal surfaces in P4 using Segre points of curves; the smooth case was classically studied by Franchetta. We introduce a class of varieties whose generic rank coincides with the one of its general entry locus, and show that any smooth and irreducible projective variety admits an embedding with this property.
Entry loci and ranks / Ballico, E.; Ventura, E.. - In: MANUSCRIPTA MATHEMATICA. - ISSN 0025-2611. - 165:3-4(2021), pp. 559-581. [10.1007/s00229-020-01216-z]
Entry loci and ranks
Ventura E.
2021
Abstract
We study entry loci of varieties and their irreducibility from the perspective of X-ranks with respect to a projective variety X. These loci are the closures of the points that appear in an X-rank decomposition of a general point in the ambient space. We look at entry loci of low degree normal surfaces in P4 using Segre points of curves; the smooth case was classically studied by Franchetta. We introduce a class of varieties whose generic rank coincides with the one of its general entry locus, and show that any smooth and irreducible projective variety admits an embedding with this property.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/2958165