题目：Action-angle coordinates? A simple story of torus action (according to Nguyen Tien Zung)

 报告人：Alain CHENCINER（巴黎七大，巴黎天文台）

摘要：

It is well known that the existence of action-angle coordinates is intimately related to the torus action associated to an integrable system. Nguyen Tien Zung reverses the point of view by showing that any tensor which is preserved by the system is also preserved by this action ... from which everything follows.

时间：4月3日 （星期二）上午 9:30-10:30

地点：首师大新教二楼827教室

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