[Turkmath:7312] FGC-Higher Structures Seminars::Rajan Mehta::28 October Tuesday, 2025 at 18:00 Istanbul time

[kazimilhan.ikeda]

Sayın Matematikçiler,

Bu Salı günü (=28 Ekim 2025) saat 18:00'da yapılacak Feza Gürsey Fizik 
ve Matematik UygAr Merkezi Yüksek Yapılar Seminerleri konuşması 
detayları aşağıdadır.

Saygılarımla,
K. İlhan İkeda

-------- Original Message --------

Dear friends,

On the 28th of October 2025 Tuesday, at 18:00 Istanbul local time (11:00 
Northampton Mass. local time), Rajan Mehta from Smith College will be 
the speaker of FGC Higher Structures Seminars.

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

Speaker: Rajan Mehta (Smith College)

Date: October 28, 2025, Tuesday
Time: 18:00 Istanbul local time / 11:00 Northampton Mass. local time

Title: Coherent 2D span-valued TQFTs

Abstract:
It is well-known that 2D TQFTs taking values in a category correspond to 
commutative Frobenius objects in that category. If the target category 
is the category of spans, it is reasonable to ask if there is a lift to 
a coherent structure (i.e. a Frobenius pseudomonoid) in the bicategory 
of spans. Such structures can be neatly described by simplicial sets, 
equipped with some additional symmetric group actions, and satisfying 
some conditions known as the "2-Segal conditions". I'll describe this 
correspondence as well as a construction that produces examples from any 
commutative monoid. This is joint work with Sophia Marx, building on 
earlier work with Ivan Contreras and Walker Stern.

Zoom link details:
(As usual the Zoom link will be active 30 minutes before the seminar 
time; that is at 17:30 Istanbul local time/10:30 Northampton Mass. local 
time)

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 17:30 Istanbul 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.