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DTSTART:20070311T020000
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DTSTAMP:20261101T133035
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Workshop / Seminar:How plabic graphs describe weakly separated collections
DESCRIPTION:Two k-element subsets I\,J of {1\,2\,…\,n} are weakly separated if the sets I\J and J\I (when drawn on a circle with vertices 1\,2\,…\,n) can be separated by a chord. A maximal weakly separated collection is a set of pairwise weakly-separated k-element subsets of {1\,2\,…\,n} that is not contained in any larger set with this property. This definition gives rise to natural combinatorial questions: How big is a maximal weakly separated collection? How many are there? How are they related to each other?\n\nI will outline how Oh\, Posknikov\, Speyer answered most of these questions via a bijection between maximal weakly separated collections in a positroid and move-equivalent plabic graphs. Along the way\, we’ll meet some fun combinatorial objects related to plabic graphs including bounded affine permutations\, Grassmann necklaces\, positroids\, and plabic tilings.
UID:154396-21917646@events.umich.edu
URL:https://events.umich.edu/event/154396
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261007T095927
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Workshop / Seminar:ISRMT Seminar: Title TBA
DESCRIPTION:Abstract: TBA
UID:153397-21915803@events.umich.edu
URL:https://events.umich.edu/event/153397
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:Off Campus Location
CONTACT:
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