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Events for March 5, 2018 from General and Seminar calendars

Geometry Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 628

Speaker: Frank Sottile, Texas A&M University

Title: Intersection Theory in Numerical Algebraic Geometry

Abstract: I will describe how some ideas from intersection theory are useful in numerical algebraic geometry. The fundamental data structure in numerical algebraic geometry is that of a witness set, which is considered to be an instantiation of Weil’s notion of a generic point. Reinterpreting a witness set in terms of duality of the intersection pairing in intersection theory leads to a generalization of the notion that makes sense on many spaces and leads to a general notion of a witness set. I will also describe how rational equivalence is linked to homotopy methods.

   These notions are most productive for homogenous spaces, such as projective spaces, Grassmannians, and their products. After explaining the general theory, I will sketch what this means for the Grassmannian. This is joint work with Bates, Hauenstein, and Leykin.

Working Seminar in Groups, Dynamics, and Operator Algebras

Time: 3:00PM - 3:50PM

Location: BLOC 506A

Speaker: Jintao Deng, Texas A&M University

Title: Groupoid III

Student/Postdoc Working Geometry Seminar

Time: 5:00PM - 6:00PM

Location: BLOC 628

Speaker: JM Landsberg, TAMU

Title: Asymptotic spectra III