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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20261002T100556
DTSTART;TZID=America/Detroit:20261009T160000
DTEND;TZID=America/Detroit:20261009T170000
SUMMARY:Workshop / Seminar:Topology seminar: End Floer homology and Exotic R^4's
DESCRIPTION:Abstract: One way to construct an exotic R^4 is to remove a slice disk from the 4-ball\, replace it with a Casson handle\, and then delete the boundary. In the 90's De Michelis and Freedman asked how the choices in this construction affect the smooth type. Since then\, this problem has seen some progress but is still not well understood. Our main result is that if two slice knots have sufficiently different knot Floer homology\, then the resulting exotic R^4's made with the simplest Casson handle are distinct. This allows us to distinguish an explicit infinite family of exotic R^4's. Our main tool is Gadgil's end Floer homology\, which we compute effectively by analyzing Heegaard Floer cobordism maps. We also discuss new phenomena related to these R^4's\, and relevance to the open problem of finding infinitely many smooth structures on all noncompact 4 manifolds. This is joint work with Jen Hom\, Tye Lidman\, and Shunyu Wan.
UID:150488-21909511@events.umich.edu
URL:https://events.umich.edu/event/150488
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260726T221623
DTSTART;TZID=America/Detroit:20261030T040000
DTEND;TZID=America/Detroit:20261030T050000
SUMMARY:Workshop / Seminar:Topology seminar: TBA
DESCRIPTION:Abstract: TBA
UID:149564-21906708@events.umich.edu
URL:https://events.umich.edu/event/149564
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260728T195313
DTSTART;TZID=America/Detroit:20261113T160000
DTEND;TZID=America/Detroit:20261113T170000
SUMMARY:Workshop / Seminar:Topology seminar: TBA
DESCRIPTION:Abstract: TBA
UID:149640-21906837@events.umich.edu
URL:https://events.umich.edu/event/149640
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260726T221338
DTSTART;TZID=America/Detroit:20261120T040000
DTEND;TZID=America/Detroit:20261120T050000
SUMMARY:Workshop / Seminar:Topology seminar: TBA
DESCRIPTION:Abstract: TBA
UID:149563-21906707@events.umich.edu
URL:https://events.umich.edu/event/149563
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260916T102118
DTSTART;TZID=America/Detroit:20261204T160000
DTEND;TZID=America/Detroit:20261204T170000
SUMMARY:Workshop / Seminar:Topology seminar: Canonical bases of skein algebras\, and categorification
DESCRIPTION:Abstract: For an oriented surface S\, the Kauffman bracket skein algebra of S is an algebra generated by isotopy classes of framed links in the thickened surface S x (-1\,1) modulo skein relations\, and it quantizes the SL2 character variety of S. I will review various vector space bases of the skein algebra\, and discuss the problem on the positivity of structure constants. I will spend enough time to give an elementary introduction\, and towards the end I will briefly present recently known results\, from quantum cluster algebras and mirror symmetry\, from foams\, and from quantized K-theoretic Coulomb branches. I hope to focus more on the last one\, which is based on my joint work 2505.13332 with Dylan Allegretti and Peng Shan\, which gives a monoidal categorification of the skein algebra of a genus zero punctured surface.
UID:152188-21913200@events.umich.edu
URL:https://events.umich.edu/event/152188
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260827T085943
DTSTART;TZID=America/Detroit:20261211T160000
DTEND;TZID=America/Detroit:20261211T170000
SUMMARY:Workshop / Seminar:Topology seminar: TBA
DESCRIPTION:Abstract: TBA
UID:151001-21910703@events.umich.edu
URL:https://events.umich.edu/event/151001
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260923T142226
DTSTART;TZID=America/Detroit:20270129T160000
DTEND;TZID=America/Detroit:20270129T170000
SUMMARY:Workshop / Seminar:Topology Seminar: TBA
DESCRIPTION:Abstract: TBA
UID:152761-21914477@events.umich.edu
URL:https://events.umich.edu/event/152761
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
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