Combinatorics and Graph Theory

John Machacek from Hampden-Sydney College will be speaking.

The title of the seminar is "Sign variation and descents."

This is a virtual meeting.

Contact Bruce E Sagan (bsagan@msu.edu) for more information.

We consider posets of (projective) sign vectors ordered by reverse inclusion of zero entries with restrictions on sign variation. We show many of these posets are partitionable and give an interpretation of the h-vector in terms of descents in signed permutations. This is joint work with Nantel Bergeron and Aram Dermenjian. Time permitting we will discuss conjectural (strong) Spernicity.

Location:	Online via Zoom [map]
Price:	free
Sponsor:	Department of Mathematics
Contact:	Department of Mathematics (517) 353-0844
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