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DTSTAMP:20201111T200000Z
UID:1604933102383@events.msu.edu
CATEGORIES:Conferences / Seminars / Lectures
DTSTART:20201111T200000Z
DTEND:20201111T205000Z
SUMMARY:Math Seminar Series
DESCRIPTION:
 Combinatorics and Graph Theory\n
 \n
 John Machacek 
 from Hampden-Sydney College will be speaking.\n
 \n
 The 
 title of the seminar is "Sign variation 
 and descents."\n
 \n
 This is a virtual meeting.\n
 \n
 Contact 
 Bruce E Sagan (bsagan@msu.edu) 
 for more information.\n
 \n
 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.\n\n
 Price: free\n
 Sponsor: Department of Mathematics\n
 Sponsor's Homepage: https://www.math.msu.edu/\n
 Contact name: Department of Mathematics\n
 Contact phone: (517) 353-0844\n
 for more info visit the web at:\n 
 https://www.math.msu.edu/Seminars/CalendarView.aspx?month-of=September2016\n
LOCATION:Online via Zoom
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