[Turkmath:7462] FGE-Yüksek Yapılar Seminerleri::Simon Willerton::14.04.2026 at 19:00 Istanbul time

[kazimilhan.ikeda]

Değerli Matematikçiler,

14 Nisan 2026 Salı günü saat 19:00'da yapılacak Feza Gürsey Fizik ve 
Matematik UygAr Merkezi Yüksek Yapılar Semineri detayları aşağıda yer 
almaktadır.

Saygılarımla,
İlhan İkeda

--------

Dear friends,

On 14.04.2026 Tuesday, at 19:00 Istanbul local time (17:00 Sheffield 
local time), Simon Willerton, from the University of Sheffield, will be 
the speaker of our FGC Higher Structures Seminars.

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

Speaker: Simon Willerton (University of Sheffield)
Date: April 14, 2026
Time: 19:00 Istanbul local time (17:00 Sheffield local time)

Title: The projection formula, extranatural transformations and surface 
diagrams in a monoidal double category

Abstract:
This talk is motivated by trying to understand how closed monoidal 
categories fit into higher categorical frameworks, in particular to 
understand why, in abstract terms, the projection formula -- f_!(a x 
f^*b) = f_!(a) x b -- holds for an adjunction f_! -| f^* when f^* strong 
closed monoidal.  The circle of ideas involves the notion of 
extranatural transformation, which is key to a formal definition of 
closed monoidal category.  These can be represented graphically using 
'surface diagrams' and it transpires that these actually have a natural 
interpretation in terms of the double category of categories, functors 
and profunctors.  Along the way we will see the notion of conjugation 
for adjunctions of two variables which will help formalize the 
projection formula result.
[See also https://arxiv.org/abs/2501.01881]

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 18:45 Istanbul LT/16:45 Sheffield 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