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<div align="center"><big><b><big>Welcome to the 2023 Spring talks of
ODTU-Bilkent Algebraic Geometry Seminars</big></b></big><b><br>
</b></div>
<div align="center"><i>since 2000</i><br>
</div>
<div align="center"><b><b>=================================================================</b></b><br>
<br>
This week the <a
href="http://www.bilkent.edu.tr/~sertoz/agseminar.htm"
target="_blank">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>
<a
href="https://www.timeanddate.com/worldclock/fixedtime.html?msg=ODT%C3%9C-Bilkent+Algebraic+Geometry+Seminar&iso=20230512T1540&p1=19"
target="_blank">Please check your time difference between Ankara
and your city here</a><br>
<b>=================================================================</b></div>
<div align="center">
<div align="center"><img
src="cid:part1.JS7MeoLU.OvCgjhKI@bilkent.edu.tr"
alt="image.png" width="438" height="521"></div>
<div align="center"><b><br>
</b><a href="https://pitzersart.com/artist/g-harvey"
target="_blank"><i>Gerald Harvey Jones (1933-2017)</i></a><br>
</div>
<br>
<div align="left"><b><b><font color="#ff0000">Speaker:<font
color="#000000"> <a
href="http://www.fen.bilkent.edu.tr/~degt/"
target="_blank">Alexander Degtyarev</a><br>
</font></font></b></b><b><b><font color="#ff0000">Affiliation:
</font><i>Bilkent</i></b></b><b><b><font color="#ff0000"><br>
Title:<font color="#000000"> Counting lines on polarized
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"> </font></font><br>
<div align="justify"><font color="#ff0000"><font color="#000000">Counting
or estimating the number of lines or, more generally, low
degree rational curves on a polarized algebraic surface is a
classical problem going back almost 1.5 centuries. After a
brief historical excurse, I will try to give an account of
the considerable progress made in the subject in the last
decade or so, mainly related to various
(quasi-)polarizations of K3-surfaces:<br>
</font></font>
<ul>
<li><font color="#ff0000"><font color="#000000">lines on
K3-surfaces with any polarization,</font></font></li>
<li><font color="#ff0000"><font color="#000000">lines on low
degree K3-surfaces with singularities,</font></font></li>
<li><font color="#ff0000"><font color="#000000">conics on low
degree K3-surfaces.</font></font></li>
</ul>
<font color="#ff0000"><font color="#000000">If time permits, I
will briefly discuss other surfaces/varieties as well.<br>
<br>
Some parts of this work are joint projects<br>
(some still in progress) with Ilia Itenberg, Słavomir Rams,
Ali Sinan Sertöz.<br>
<br>
</font></font></div>
</div>
<div align="left"><font color="#ff0000"><font color="#000000"> <br>
</font></font></div>
<div align="left"><font color="#ff0000"><font color="#000000"><b><font
color="#ff0000">Date:<font color="#000000"> 12 May 2023</font></font></b>,
<b>Friday</b></font></font><br>
</div>
<div align="left"><font color="#ff0000"><font color="#000000"><b><font
color="#ff0000">Time: </font>15:40 <i>(GMT+3)</i></b><br>
<b><font color="#ff0000">Place: </font></b><font
color="#ff0000"><font color="#000000"><b>Zoom</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">One
day before the seminar, an announcement with the
Zoom meeting 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">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">If
you have not registered before, please contact him
at <a
href="mailto:sertoz@bilkent.edu.tr?subject=Zoom%20Seminar%20Address%20Request"
target="_blank">sertoz@bilkent.edu.tr</a>.</b></b></font></font></font></font></p>
</blockquote>
<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</div>
<div align="left"><font size="1"><i>(PS: To unsubscribe from this
list please send me a note.)</i></font> </div>
<hr>
<pre cols="72">----------------------------------------------------------------------------
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: <a href="mailto:sertoz@bilkent.edu.tr" target="_blank" class="moz-txt-link-freetext">sertoz@bilkent.edu.tr</a>
Web: <a href="http://sertoz.bilkent.edu.tr" target="_blank">sertoz.bilkent.edu.tr</a>
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