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DTSTAMP:20261011T194247
DTSTART;TZID=America/Detroit:20261014T143000
DTEND;TZID=America/Detroit:20261014T153000
SUMMARY:Workshop / Seminar:Learning Seminar in Algebraic Combinatorics
DESCRIPTION:This talk will be an introduction to Nakajima quiver varieties\, focusing on type A quivers. We will begin with a brief recount of quiver representations\, including discussion of kernels and indecomposables. We will define the notion of framing\, and impose a ``stability condition\" on framed quiver representations to obtain what we will call pre-quiver varieties\, of which the Grassmannians and complete flag varieties are examples. Next\, we will introduce the doubled framed quiver. Imposing both the stability condition and additional \"moment map condition\" on doubled framed quiver representations yields the notion of a Nakajima quiver variety. Examples include cotangent bundles of Grassmannians and complete flag varieties.
UID:153542-21915986@events.umich.edu
URL:https://events.umich.edu/event/153542
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Combinatorics,Mathematics
LOCATION:East Hall - 4088
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261011T205828
DTSTART;TZID=America/Detroit:20261014T143000
DTEND;TZID=America/Detroit:20261014T153000
SUMMARY:Workshop / Seminar:Student Number Theory: An Introduction to Perfectoid Theory
DESCRIPTION:Nearly fifteen years ago\, Peter Scholze introduced perfectoid fields\, establishing a bridge between deeply ramified fields of characteristic zero and characteristic (p). Perfectoid theory has since found important applications in arithmetic geometry. In this talk\, I will follow Scholze’s original paper to give an introduction to perfectoid fields and\, if time permits\, perfectoid spaces.
UID:153543-21915987@events.umich.edu
URL:https://events.umich.edu/event/153543
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261001T231756
DTSTART;TZID=America/Detroit:20261014T150000
DTEND;TZID=America/Detroit:20261014T160000
SUMMARY:Workshop / Seminar:Entropy-Regularized Finite-State Mean Field Control Problems
DESCRIPTION:We study an infinite-horizon discounted mean field control problem for finite-state nonlinear continuous-time Markov chains. Controls are locally integrable transition-rate matrices and are penalized by relative entropy with respect to a state-dependent reference generator. We prove that the value function is the unique bounded viscosity solution on the closed simplex of the Hamilton–Jacobi–Bellman equation by a direct dynamic-programming argument and a finite-state comparison principle. Under a uniform semiconvexity condition and C¹\,¹ regularity\, the value function is globally semiconvex and intrinsically C¹\,¹ on the closed simplex and yields a Gibbs feedback that is the unique Hamiltonian minimizer at interior states. For positive\, symmetric\, possibly state-dependent reference rates\, an entropy-plus-value free energy decays globally exponentially when the temperature parameter is compatible with the semiconvexity modulus. We also establish a discounted planner-to-game correspondence for potential mean field games under a state-independent reference generator.
UID:153194-21915402@events.umich.edu
URL:https://events.umich.edu/event/153194
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:Angell Hall - AHG128
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261012T091010
DTSTART;TZID=America/Detroit:20261014T150000
DTEND;TZID=America/Detroit:20261014T160000
SUMMARY:Workshop / Seminar:Student DGT: Dehn Surgery Number
DESCRIPTION:Dehn surgery is one of the most basic operations in the study of low dimensional topology that allows us to produce new manifolds. In this talk we will sketch a variety of results concerning Dehn surgery ranging from classical to current research level results. This talk will be accessible to first year graduate students.
UID:153552-21915996@events.umich.edu
URL:https://events.umich.edu/event/153552
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 1866
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261012T212127
DTSTART;TZID=America/Detroit:20261014T150000
DTEND;TZID=America/Detroit:20261014T163000
SUMMARY:Workshop / Seminar:Student Life Coaching Circles
DESCRIPTION:Join us for our annual Coaching Cirlces!  Each coaching session will provide 8-10 staff members with an opportunity to interact informally with a Student Life Unit Director (or leader) around a leadership topic of interest to them. These are informal conversations (rather than workshops or presentations) between staff and these leaders who have experience with and willingness to share their wisdom around these topics.Staff are asked to register for no more than one coaching circle a semester. Space is very limited\, register today!
UID:152716-21914415@events.umich.edu
URL:https://events.umich.edu/event/152716
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Sessions
LOCATION:Ginsberg Center, Room 1080
CONTACT:
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