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TZID:America/Detroit
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TZOFFSETFROM:-0500
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TZNAME:EDT
DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20260908T142951
DTSTART;TZID=America/Detroit:20260918T150000
DTEND;TZID=America/Detroit:20260918T160000
SUMMARY:Workshop / Seminar:Extremal set theory as algebraic geometry
DESCRIPTION:Extremal set theory asks questions such as \"what is the largest family of pairwise intersecting k-element subsets of an n-element set?\"  Many questions of this type can be modeled with exterior algebras\, and admit extensions such as \"what is the largest self-annihilating subspace of k-forms in an n-variable exterior algebra?\"  The shifting technique in extremal set theory corresponds to algebraic geometric limits of certain curves in a Grassmannian.\n\nIn this talk\, I will overview these connections\, and go on to discuss recent joint work with Bulavka and Gandini.  We find a maximum subspace of k-forms in an n-variable exterior algebra that is self-annihilating but not annihilated by any 1-form.  A difficulty is that \"not annihilated by any 1-form\" is not a closed condition in the Grassmannian.  This work extends the Hilton-Milner theorem of extremal set theory to the exterior algebra setting\, and answers questions of Scott and Wilmer and of my own.
UID:149342-21906254@events.umich.edu
URL:https://events.umich.edu/event/149342
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260910T095305
DTSTART;TZID=America/Detroit:20260925T150000
DTEND;TZID=America/Detroit:20260925T160000
SUMMARY:Workshop / Seminar:A tale of two polynomials: positivity in wonderful varieties and matroids
DESCRIPTION:I will share a story of two polynomials\, the Poincarè polynomial of Chow rings of toric varieties of matroids\, and the h-polynomials of nested set complexes of matroids. The story is set in a rich network of positivity properties coming from geometry and combinatorics of matroids\, with connections to moduli spaces of rational stable curves. The main theorems are matroidal analogues of Gal’s conjecture\, and real-rootedness of some of these polynomials. (Joint works with Basile Coron\, and Luis Ferroni)
UID:149752-21907056@events.umich.edu
URL:https://events.umich.edu/event/149752
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260731T230300
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:149734-21907011@events.umich.edu
URL:https://events.umich.edu/event/149734
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260803T110907
DTSTART;TZID=America/Detroit:20261009T150000
DTEND;TZID=America/Detroit:20261009T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:149753-21907057@events.umich.edu
URL:https://events.umich.edu/event/149753
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260824T192740
DTSTART;TZID=America/Detroit:20261016T150000
DTEND;TZID=America/Detroit:20261016T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150856-21910313@events.umich.edu
URL:https://events.umich.edu/event/150856
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260806T203850
DTSTART;TZID=America/Detroit:20261023T150000
DTEND;TZID=America/Detroit:20261023T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:149981-21907760@events.umich.edu
URL:https://events.umich.edu/event/149981
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260807T112526
DTSTART;TZID=America/Detroit:20261030T150000
DTEND;TZID=America/Detroit:20261030T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBA
UID:149993-21907789@events.umich.edu
URL:https://events.umich.edu/event/149993
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260812T081935
DTSTART;TZID=America/Detroit:20261106T150000
DTEND;TZID=America/Detroit:20261106T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150159-21908304@events.umich.edu
URL:https://events.umich.edu/event/150159
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260807T112535
DTSTART;TZID=America/Detroit:20261113T150000
DTEND;TZID=America/Detroit:20261113T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBA
UID:149671-21906924@events.umich.edu
URL:https://events.umich.edu/event/149671
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260812T122132
DTSTART;TZID=America/Detroit:20261120T150000
DTEND;TZID=America/Detroit:20261120T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150177-21908328@events.umich.edu
URL:https://events.umich.edu/event/150177
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260814T161254
DTSTART;TZID=America/Detroit:20261204T150000
DTEND;TZID=America/Detroit:20261204T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150291-21908975@events.umich.edu
URL:https://events.umich.edu/event/150291
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:
CONTACT:
END:VEVENT
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