Secant cumulants and toric geometry

M. Michalek, L. Oeding, P.W. Zwiernik

Research output: Book/ReportReportAcademic

Abstract

We study the secant line variety of the Segre product of projective spaces using special cumulant coordinates adapted for secant varieties. We show that the secant variety is covered by open normal toric varieties. We prove that in cumulant coordinates its ideal is generated by binomial quadrics. We present new results on the local structure of the secant variety. In particular, we show that it has rational singularities and we give a description of the singular locus. Generalizing results of Sturmfels and Zwiernik, we also show analogous results for the tangential variety.
Original languageEnglish
Publishers.n.
Publication statusPublished - 2012

Publication series

NamearXiv.org
Volume1212.1516 [math.AG]

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