3:30 pm Thursday, December 3, 2020
geometry seminar: When are multidegrees positive? by
Federico Castillo [mail] (Max-Planck Leipzig MPI) in Zoom
The notion of multidegree for multiprojective varieties extends that of degree for projective varieties. They can be defined in geometric terms, using intersection theory, or alternatively in algebraic terms, via multigraded hilbert polynomial. We study the problem of their positivity and establish a wonderful combinatorial description that relates to polyhedral geometry. We will show applications for Schubert polynomials and mixed volumes. This is joint work with Y.Cid-Ruiz, B.Li, J.Montano, and N.Zhang. Submitted by
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