<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;">You are cordially invited to the Mathematics Colloquium at <b class="">15:40</b> in the <b class="">FENS building</b> on Sabancı Campus<b class=""> </b>in room <b class="">2019 </b>on <b class="">Thursday 21 March 2019</b>.<div class=""></div></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><br class=""></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><div class=""><b class="">Speaker:</b> Özgür Kişsel (Middle East Technical University)</div><div class=""><div class=""><b class="">Title: </b>Real and Complex Line Arrangements </div><div class=""><br class=""></div><div class=""><b class="">Abstract:</b> There are many natural problems of interest concerning the arrangement of lines in the real or complex projective plane related to the combinatorial properties of the resulting cell complex. In this talk I first wish to introduce some of these problems and some recent developments about them. Finally, I will present certain realizability results about a certain subclass of line arrangements, called nets, that we obtained in our joint work with A. Bassa. </div></div></div><div class=""><br class=""></div><div class="">Kind regards,</div><div class="">Michel Lavrauw.</div></body></html>