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DTSTART:20070311T020000
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DTSTAMP:20260125T112641
DTSTART;TZID=America/Detroit:20260128T150000
DTEND;TZID=America/Detroit:20260128T160000
SUMMARY:Workshop / Seminar:Trees and SL2
DESCRIPTION:A common theme in mathematics is to understand algebraic objects using their actions on geometric spaces. Bass—Serre theory is one instance of this approach where one studies groups via their actions on trees. I will give an introduction to the simplest case of Bass—Serre theory and build a dictionary between gluing of spaces\, amalgamation of groups\, and actions on trees. This dictionary gives us a surprising amount of information about the structure of groups\, especially about their torsion subgroups. I will demonstrate this by applying the theory to SL2(Z)\, SL2(Q_p)\, and SL2(F_p((t))).
UID:144436-21895352@events.umich.edu
URL:https://events.umich.edu/event/144436
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - EH3866
CONTACT:
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DTSTAMP:20260114T220853
DTSTART;TZID=America/Detroit:20260128T153000
DTEND;TZID=America/Detroit:20260128T170000
SUMMARY:Workshop / Seminar:Algebraic Geometry Seminar: On the P=C conjecture
DESCRIPTION:I will introduce the P=C conjecture which is an analogue of the P=W conjecture in the setting of a del Pezzo surface S. The main character of the conjecture is the moduli space M of one-dimensional sheaves on S. The perverse filtration records the topology of the Hitchin-type fibration\, while the Chern filtration records the shape of tautological relations. The perverse filtration is of particular interest because it conjecturally categorifies the Gopakumar-Vafa invariants of a local Calabi-Yau 3-fold. This is a joint work with Y. Kononov\, M. Moreira\, W. Pi.
UID:141272-21888524@events.umich.edu
URL:https://events.umich.edu/event/141272
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4096
CONTACT:
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