天元讲堂（5.25）：Similar simple geometric pictures in complicated topology and algebra
报告题目：Similar simple geometric pictures in complicated topology and algebra （一）
报告时间：2017年5月25日（星期四）13:30—14:30
报告地点：苏州大学本部维格堂404
报告人：张永恒（Amherst College）
报告提要：In topology, iterated loop space plays fundamental roles in homotopy theory. In algebra, Hochschild cochain complex has important applications in deformation quantization and noncommutative geometry. In 1993, after comparing their homologies, Pierre Deligne conjectured the similarity between these two disparate objects of study. In this talk, I will explain the background of this conjecture.
报告题目：Similar simple geometric pictures in complicated topology and algebra （二）
报告时间：2017年5月25日（星期四）14:40—15:40
报告地点：苏州大学本部维格堂404
报告人：张永恒（Amherst College）
报告提要：In topology, iterated loop space plays fundamental roles in homotopy theory. In algebra, Hochschild cochain complex has important applications in deformation quantization and noncommutative geometry. In 1993, after comparing their homologies, Pierre Deligne conjectured the similarity between these two disparate objects of study. In this talk, I will explain the similarity in terms of simple but powerful geometric pictures of operads and polytopes.