[Turkmath:4863] ODTU-Bilkent Algebraic Geometry Seminar-Zoom-488

[Ali Sinan Sertöz]

*
*
*Welcome to the 2021 Spring talks of ODTU-Bilkent Algebraic Geometry 
Seminars**
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/since 2000/
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This week the ODTU-Bilkent Algebraic Geometry Seminar 
<http://www.bilkent.edu.tr/%7Esertoz/agseminar.htm>  is *Online.*

/This talk will begin at _*15:40*__(GMT+3)_/

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**//
/Fikret Muallâ (1903-1967)
Üstünel Collection
/

**Speaker: Çisem Güneş Aktaş*
*Affiliation: Abdullah Gül
Title:Real representatives of equisingular strata of  projective models 
of K3-surfaces

**
**Abstract:**It is a wide open problem what kind of singularities a 
projective surface or a curve of a given degree can have. In general, 
this problem seems hopeless. However, in the case of K3-surfaces, the 
equisingular deformation classification of surfaces with any given 
polarization becomes a mere computation.

In this talk, we will discuss projective models of K3-surfaces of 
different polarizations  together with the deformation classification 
problems.  Although it is quite common that a real variety may have no 
real points, very few examples of equisingular deformation classes with 
this property are known.  We will study an algorithm detecting real 
representatives in equisingular strata of projective models of 
K3-surfaces. Then, we will apply this algorithm to spatial quartics and 
find two new examples of real strata without real representatives where 
the only previously known example of this kind is in the space of plane 
sextics.

*Date:30 April 2021*, Friday
*Time: 15:40* (GMT+3)
*Place: **Zoom
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    **One day before the seminar, an announcement with the Big Blue
    Button 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
    atsertoz at bilkent.edu.tr
    <mailto:sertoz at bilkent.edu.tr?subject=Zoom%20Seminar%20Address%20Request>.**

**


Please bring your own tea and cookies and self-serve at the convenience 
of your own home! 😁

You are most cordially invited to attend.

Ali Sinan Sertöz
**

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Ali Sinan Sertöz
Bilkent University, Department of Mathematics, 06800 Ankara, Turkey
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
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