Department of Mathematics

Combinatorics and Graph Theory

  •  John Machacek, Hampden-Sydney College
  •  Sign variation and descents
  •  11/11/2020
  •  3:00 PM - 3:50 PM
  •  Online (virtual meeting) (Virtual Meeting Link)
  •  Bruce E Sagan (

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.



Department of Mathematics
Michigan State University
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C212 Wells Hall
East Lansing, MI 48824

Phone: (517) 353-0844
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College of Natural Science