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Events for January 28, 2020

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12:15 pm

Castelnuovo-Mumford regularity of edge ideals of graphs (Siamak Yassemi, University of Tehran)

January 28, 2020 @ 12:15 pm - 1:10 pm
Emmy Noether Room, Millikan 1021, Pomona College, 610 N. College Ave.
Claremont, California 91711
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Let K be a field and S = K be the polynomial ring in n variables over K. For a graded S-module M with minimal free resolution the Castelnuovo-Mumford regularity  is defined. We survey a number of recent studies of the Castelnuovo-Mumford regularity of the ideals related to a graph and their (symbolic) powers. Our […]

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3:00 pm

Stefano Vidussi (UCRiverside)

January 28, 2020 @ 3:00 pm - 4:00 pm

Title: The BNS invariant of the fundamental group of a surface bundle over a surface. Abstract: We will discuss some new results on the Bieri-Neumann-Strebel invariant of these groups, showing in particular that (with obvious exceptions) they algebraically fiber. As a corollary, we show that for "most" bundles these groups are not coherent.

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