[Turkmath:7344] ODTU-Bilkent Algebraic Geometry Seminar-Zoom-577

[Ali Sinan Sertöz]

*Welcome to the 2025 Fall talks of ODTÜ-Bilkent Algebraic Geometry 
Seminars**
*
/since 2000/
**=================================================================**

This week the ODTÜ-Bilkent Algebraic Geometry Seminar 
<http://www.bilkent.edu.tr/~sertoz/agseminar.htm>  is *online*

/This talk will begin at _*15:40*__ (GMT+3)_/
Please check your time difference between Ankara and your city here 
<https://www.timeanddate.com/worldclock/fixedtime.html?msg=ODT%C3%9C-Bilkent+Algebraic+Geometry+Seminar&iso=20251212T1540&p1=19&ah=1>
*=================================================================

*

/İbrahim Çallı (1882-1960)
/
/
/
/
/
**Speaker: Alexander Degtyarev <http://www.fen.bilkent.edu.tr/%7Edegt/>**
******Affiliation: /Bilkent

/**
**Title:  Automorphisms of sextic $K3$-surfaces**
**
**
**Abstract:** $K3$-surfaces play the role of elliptic curves in the 
realm of algebraic surfaces. They are sophisticated enough to produce 
interesting and meaningful results that may hint possible 
generalizations, yet simple enough to make their study feasible. One 
remarkable feature of $K3$-surfaces is that, among all complete 
intersections of dimension at least two, they are the only ones whose 
group of projective automorphisms may (and typically is) much smaller 
than their group of birational automorphisms.

I will discuss a particular example of sextic $K3$-surfaces and a 
particular construction of non-projective automorphisms, related to 
lines. In particular, it will be shown that, whenever a sextic has at 
least two lines, its group of birational automorphisms is infinite.

This is a joint work with Igor Dolgachev, Shigeyuki Kondo, and Slawomir 
Rams.

*Date: 12 December 2025, Friday*
*Time: 15:40 /(GMT+3)/*
*Place: **Zoom*

    /*Participants who have registered will receive the Zoom link via
    email one day before the seminar.*/

    /*If you registered for a previous talk in this series, there's no
    need to register again—you'll automatically receive the link for
    this session.*/

    /*If you haven't registered yet, please contact
    sertoz at bilkent.edu.tr to be added to the mailing list.*/

You are most cordially invited to attend.

Ali Sinan Sertöz

*/*/This seminar series is organized by a joint team from ODTÜ and Bilkent

Alexander Degtyarev (Bilkent)
Ali Sinan Sertöz (Bilkent) contact person
Ali Ulaş Özgür Kişisel (ODTÜ)
Yıldıray Ozan (ODTÜ)
/*/*

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

----------------------------------------------------------------------------
Ali Sinan Sertöz
Bilkent University, Department of Mathematics, 06800 Ankara, Türkiye
Office: (90)-(312) - 290 1490
Department: (90)-(312) - 266 4377
e-mail:sertoz at bilkent.edu.tr <mailto:sertoz at bilkent.edu.tr> 
Web:sertoz.bilkent.edu.tr <http://sertoz.bilkent.edu.tr> 
----------------------------------------------------------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://yunus.listweb.bilkent.edu.tr/pipermail/turkmath/attachments/20251208/76f34294/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: K1YiUHWB2EjbJoJh.jpg
Type: image/jpeg
Size: 1199645 bytes
Desc: not available
URL: <http://yunus.listweb.bilkent.edu.tr/pipermail/turkmath/attachments/20251208/76f34294/attachment-0001.jpg>