<div dir="ltr"><div><div style="font-size:14px">皆様</div><div style="font-size:14px"><br></div><div style="font-size:14px"><div>今年度,第二回目の明治大学<span class="">幾何</span>学<span class="">セミナ</span>ーを以下の要領で開催致しますのでお知らせ致します.</div><div><br></div><div>日程:2015年7月9日(木)16:30-18:00</div><div>場所:第二校舎6号館6706</div><div><br></div><div>講演者:黒木 慎太郎氏(東京大学)</div><div><br></div><div>講演題目:The root system of torus graphs</div><div><br></div><div>概要:The notion of torus graph is introduced by Maeda-Masuda-Panov as the GKM graph analogue of torus manifolds. Here, a torus manifold is an even dimensional manifold which has a half dimensional torus action with fixed points.</div>In this talk, I introduce the root system of torus graphs combinatorially and characterize when a torus manifold has an extended action. If time permits, I also introduce some classification results of combinatorial types of torus graphs with the root system.<div><br></div></div><div style="font-size:14px"><div><span style="border-collapse:collapse"><font face="arial, helvetica, sans-serif"><div><br></div><div>興味を持たれそうな方がおられましたら周知してくださいますと幸いです.皆様のご参加をお待ちしております.</div><div><br></div></font></span></div><div><font face="arial, helvetica, sans-serif"><span class="">幾何</span><span class="">セミナ</span>ーのホームページ:</font></div><div><a href="http://www.isc.meiji.ac.jp/~takahiko/GeometrySeminar/index.html" target="_blank">http://www.isc.meiji.ac.jp/~takahiko/GeometrySeminar/index.html</a></div></div></div><div><br></div><br clear="all"><div><div class="gmail_signature"><div dir="ltr">吉田尚彦<div>明治大学理工学部数学科</div><div>Takahiko Yoshida</div><div>Department of Mathematics</div><div>School of Science and Technology</div><div>Meiji University</div></div></div></div>
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