[Turkmath:5845] ODTU-Bilkent Algebraic Geometry Seminar-Zoom-517

[Ali Sinan Sertöz]

*Welcome to the 2022 Fall talks of ODTU-Bilkent Algebraic Geometry 
Seminars**
*
/since 2000/
**=================================================================**

This week the ODTU-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=20221125T1540&p1=19>
*=================================================================*

**
/Erin Hanson/
**Speaker:Davide Cesare Veniani
****Affiliation: /Stuttgart/****
Title:Non-degeneracy of Enriques surfaces

**
**Abstract:**Enriques' original construction of Enriques surfaces 
involves a 10-dimensional family of sextic surfaces in the projective 
space which are non-normal along the edges of a tetrahedron. The 
question whether all Enriques surfaces arise through Enriques' 
construction has remained open for more than a century.

In two joint works with G. Martin (Bonn) and G. Mezzedimi (Hannover), we 
have now settled this question in all characteristics by studying 
particular configurations of genus one fibrations, and two invariants 
called maximal and minimal non-degeneracy. The proof involves so-called 
`triangle graphs' and the distinction between special and non-special 
3-sequences of half-fibers.

In this talk, I will present the problem and explain its solution, 
illustrating further possible developments and applications.

*Date:25 November 2022*, *Friday*
*Time: 15:40 /(GMT+3)/*
*Place: **Zoom*

    **One day before the seminar, an announcement with the Zoom meeting
    link will be sent to those who registered with Sertöz.
    **

    **If you have registered before for one of the previous talks, there
    is no need to register again; you will automatically receive a link
    for this talk too.
    **

    **If you have not registered before, please contact him at
    sertoz at bilkent.edu.tr
    <mailto:sertoz at bilkent.edu.tr?subject=Zoom%20Seminar%20Address%20Request>.**


You are most cordially invited to attend.

Ali Sinan Sertöz

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Ali Sinan Sertöz
Bilkent University, Department of Mathematics, 06800 Ankara, Türkiye
Office: (90)-(312) - 290 1490
Department: (90)-(312) - 266 4377
Fax: (90)-(312) - 290 1797
e-mail:sertoz at bilkent.edu.tr  
Web:sertoz.bilkent.edu.tr  <http://sertoz.bilkent.edu.tr>  
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