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<div align="center"><big> <b><big><br>
</big></b></big></div>
<div align="center"><big><b><big>Welcome to the 2021 Spring talks of
ODTU-Bilkent Algebraic Geometry Seminars</big></b></big><b><br>
</b><b> </b><b> </b></div>
<b> </b>
<div align="center"><i>since 2000</i><br>
<b> </b> </div>
<div align="center"><b> </b><b> </b><b><b>=================================================================</b>
</b><br>
<b> </b><br>
This week the <a
href="http://www.bilkent.edu.tr/%7Esertoz/agseminar.htm"
target="_blank" moz-do-not-send="true">ODTU-Bilkent Algebraic
Geometry Seminar</a> is <b>Online.</b> <br>
<br>
<i><font color="#ff00ff">This talk will begin at <u><b>15:40</b></u><u>
(GMT+3)</u></font></i><br>
<br>
<b>=================================================================</b></div>
<div align="center"><br>
<br>
<div align="center"><b><img
src="cid:part2.78E4A67E.09757E2E@bilkent.edu.tr" alt=""
class=""> </b><font size="-1"><i> </i></font></div>
<div align="center"><font size="-1"><i>Fikret Muallâ (1903-1967)<br>
Üstünel Collection<br>
</i></font></div>
<div align="left"><br>
<b><b><font color="#ff0000">Speaker: <font color="#000000">Çisem
Güneş Aktaş</font></font></b><br>
<span lang="tr"></span><b><font color="#ff0000">Affiliation: <font
color="#000000">Abdullah Gül</font><br>
Title:<font color="#000000"> Real representatives of
equisingular strata of projective models of K3-surfaces<br>
</font><br>
</font></b></b></div>
</div>
<div align="left"><b><b><font color="#ff0000">Abstract:</font></b></b><font
color="#ff0000"><font color="#000000"> 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.<br>
<br>
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.<br>
<br>
</font></font></div>
<div align="left"><font color="#ff0000"><font color="#000000"><b><font
color="#ff0000">Date:<font color="#000000"> 30 April 2021</font></font></b>,
Friday</font></font><br>
</div>
<div align="left"><font color="#ff0000"><font color="#000000"><b> <font
color="#ff0000">Time: </font>15:40</b> (GMT+3) <br>
<b><font color="#ff0000">Place: </font></b><font
color="#ff0000"><font color="#000000"><b>Zoom<br>
</b></font></font></font></font></div>
<div align="left"><font color="#ff0000"><font color="#000000"><font
color="#ff0000"><font color="#000000"><b><br>
</b></font></font></font></font></div>
<blockquote>
<p><font color="#ff0000"><font color="#000000"><font
color="#ff0000"><font color="#000000"><b><b style="color:
rgb(51, 51, 51); font-family: arial, verdana,
sans-serif; font-size: 14px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps:
normal; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: 2; word-spacing:
0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);
text-decoration-style: initial;
text-decoration-color: initial;">One day before the
seminar, an announcement with the Big Blue Button
link will be sent to those who registered with
Sertöz. <br>
</b></b></font></font></font></font></p>
<p><font color="#ff0000"><font color="#000000"><font
color="#ff0000"><font color="#000000"><b><b style="color:
rgb(51, 51, 51); font-family: arial, verdana,
sans-serif; font-size: 14px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps:
normal; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: 2; word-spacing:
0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);
text-decoration-style: initial;
text-decoration-color: initial;">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.<br>
</b></b></font></font></font></font></p>
<p><font color="#ff0000"><font color="#000000"><font
color="#ff0000"><font color="#000000"><b><b style="color:
rgb(51, 51, 51); font-family: arial, verdana,
sans-serif; font-size: 14px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps:
normal; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: 2; word-spacing:
0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);
text-decoration-style: initial;
text-decoration-color: initial;">If you have not
registered before, please contact him at<span> <a
moz-do-not-send="true"
href="mailto:sertoz@bilkent.edu.tr?subject=Zoom%20Seminar%20Address%20Request">sertoz@bilkent.edu.tr</a></span>.</b></b></font></font></font></font></p>
</blockquote>
<p><font color="#ff0000"><font color="#000000"><font color="#ff0000"><font
color="#000000"><b> </b></font></font></font></font></p>
<div align="left"><br>
</div>
<div align="left">Please bring your own tea and cookies and
self-serve at the convenience of your own home! 😁<span
class="moz-smiley-s1"><span></span></span></div>
<div align="left"><br>
</div>
<div align="left">You are most cordially invited to attend.</div>
<div align="left"><br>
</div>
<div align="left">Ali Sinan Sertöz<br>
<font color="#ff0000"><font color="#000000"><b><font
color="#ff0000"> </font></b></font></font></div>
<div align="left"><font color="#ff0000"><font color="#000000"><br>
</font></font></div>
<pre class="moz-signature" signature-switch-id="07ffc569-c388-4f65-9311-87f39bd235fa" cols="72">----------------------------------------------------------------------------
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: <a class="moz-txt-link-abbreviated" href="mailto:sertoz@bilkent.edu.tr" moz-do-not-send="true">sertoz@bilkent.edu.tr</a>
Web: sertoz.bilkent.edu.tr
----------------------------------------------------------------------------</pre>
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