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DTSTART:20070311T020000
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DTSTAMP:20260913T130335
DTSTART;TZID=America/Detroit:20260914T160000
DTEND;TZID=America/Detroit:20260914T170000
SUMMARY:Workshop / Seminar:Plabic Graphs\, Honeycombs\, and Hives
DESCRIPTION:This expository talk introduces three families of combinatorial objects connecting linear algebra\, representation theory\, and the geometry of the Grassmannian. Plabic graphs were introduced by Postnikov to index and parametrize positroid cells in the totally nonnegative Grassmannian. Knutson and Tao's honeycombs describe eigenvalues of Hermitian matrices A\, B\, and A+B\; their dual model\, hives\, give a lattice-point-counting rule for Littlewood-Richardson coefficients. Through small examples\, I will explain each construction\, and illustrate the correspondence between honeycombs and hives\, and their relationships to local moves on plabic graphs. No prior familiarity with the topics will be assumed. This exposition follows a part of Postnikov's talk \"Honeycombs\, Plabic Graphs\, and Polypositroids\" from AsiaComb 2026\, supplemented by the work of Knutson-Tao-Woodward on hives and the octahedron recurrence.
UID:152056-21912773@events.umich.edu
URL:https://events.umich.edu/event/152056
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
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DTSTAMP:20260713T141025
DTSTART;TZID=America/Detroit:20260914T160000
DTEND;TZID=America/Detroit:20260914T172000
SUMMARY:Workshop / Seminar:Public Finance Seminar: Monday\, September 14
DESCRIPTION:--
UID:149324-21906233@events.umich.edu
URL:https://events.umich.edu/event/149324
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Economics,Public Finance,seminar
LOCATION:North Quad - 4325
CONTACT:
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