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# Bernd Sturmfels : Real rank-two geometry

The real rank-two locus of an algebraic variety is the closure of the union of all secant lines spanned by real points. We seek a semi-algebraic description of this set. Its algebraic boundary consists of the tangential variety and the edge variety. Our study of Segre and Veronese varieties yields a characterization of tensors of real rank two. This is joint with Anna Seigal.

**Category**: Algebraic Geometry**Duration**: 01:34:49**Date**: February 10, 2017 at 3:10 PM**Views**: 109-
**Tags:**seminar, Algebraic Geometry Seminar

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