[Turkmath:7445] FGC-Higher Structures Seminars::Shannon Rubin::31.03.2026 at 16:00 Istanbul time

[kazimilhan.ikeda]

Değerli matematkçiler,

Aşağıda 31 Mart 2026 Salı günü saat 16:00'da çevrimiçi yapılan 
FGC-Yüksek Yapılar Seminerleri kapsamında gerçekleşecek konuşma 
detaylarını bulacaksınız.

Saygılarımla,
İlhan İkeda

-------------

Dear friends,

On 31.03.2026 Tuesday, at 16:00 Istanbul local time (21:00 Beijing local 
time), Shannon Rubin, from Yau Mathematical Sciences Center - Tsinghua 
University, will be the speaker of our FGC Higher Structures Seminars.

The details of Shannon's seminar talk are as follows:

Speaker: Shannon Rubin (Yau Mathematical Sciences Center - Tsinghua 
University)
Date: March 31, 2026
Time: 16:00 Istanbul local time (21:00 Beijing local time)

Title: A hotomotopical invariant of Weinstein surfaces

Abstract:
In symplectic geometry, a Weinstein surface W can be understood by 
combinatorial data on its skeleton, which is generically a finite 
trivalent graph G. Motivated by the microlocal theory of sheaves, there 
is a naturally associated diagram D of differential-graded categories, 
defined over the quiver which replaces each edge of G by a cospan. We 
call such quivers 'graphic'. After adding in appropriate homological 
shifts, the homotopy limit of D yields an invariant of W, so we are 
motivated to find explicit presentations for these homotopy limits.

Abstracting the story above, we fix an arbitrary graphic quiver Q. Given 
any model category M (above we had M = dg-categories) we consider 
M-valued diagrams over Q. In this talk I will present a combinatorial 
characterization of all such diagrams D which are suitably 'fibrant,' 
which in particular implies that the homotopy limit of D is just its 
classical limit. Analogous to the calculation of derived functors in 
homological algebra, this yields an explicit formula for the homotopy 
limit of any diagram.

Zoom link details:
Feza Gursey Center for Physics and Mathematics is inviting you to a 
scheduled Zoom meeting.
Topic: Higher Structures Seminars

Time: This is a recurring meeting Meet anytime (so Zoom link will be 
active at 15:45 Istanbul LT/20:45 Beijing LT on)

Join Zoom Meeting: 
https://ozyegin-edu-tr.zoom.us/j/93563904955?pwd=9xh1VJjxaaiShD7SmI0YLs3XemY1hQ.1

Meeting ID: 935 6390 4955
Passcode: 699568

Best regards,
Ilhan

Organized by Feza Gürsey Center for Physics and Mathematics.
Zoom link is kindly provided by Özyeğin University.

Feza Gürsey Fizik ve Matematik UygAr Merkezi tarafından 
düzenlenmektedir.
Zoom bağlantısı Özyeğin Üniversitesi tarafından sağlanmaktadır