报告人:左怀青 (清华大学)

时间: 2021年9月 24日 上午 9:00-10:00

腾讯会议: 249789572

摘要: Let R be a positively graded algebra which define an isolated singularity. A long-standing conjecture in algebraic geometry and singularity theory  is the non-existence of negative weight derivations on certain R.  Halperin and Alexsandrov conjectured that there are no negative weight derivations when R is a complete intersection graded Artinian algebra, and Wahl conjectured there are no negative weight derivations on R when R is isolated normal singularity admits a good $C^*$ action. This problem is also important in rational homotopy theory. In this talk, we will briefly review the background and present our recent progress on the problem of  non-existence of negative weight derivations.

邀请人：龚成