筑波大学トポロジーセミナー
世話人：川村一宏，平山至大，石井敦，丹下基生，蓮井翔
| 日時 | ２０１２年１０月４日（木）１６：５０－１７：５０ |
|---|---|
| 場所 | 筑波大学 自然系学系Ｄ棟 Ｄ５０９ |
| 講演者 | 北山貴裕 氏 （京都大学 数理解析研究所） |
| 講演題目 | On an analogue of Culler-Shalen theory for higher dimensional representations |
| アブストラクト | Culler and Shalen established a way to construct incompressible surfaces in a 3-manifold from ideal points of the SL_2-character variety. We present an analogous theory to construct certain kinds of branched surfaces from limit points of the SL_n-character variety. Such a branched surface induces a nontrivial presentation of the fundamental group as a 2-dimensional complex of groups. This is a joint work with Takashi Hara (Osaka University). |
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