Location：lecture hall

Time：Feb 23，15:00-17:00

Speaker：涂君武（上海科技大学）

Abstract：We shall review Costello’s definition of Gromov-Witten type invariants in all genus associated with Calabi-Yau A-infinity categories. Then we write down an explicit formula of these invariants in terms of certain stable graphs whose vertices are decorated by ribbon graphs. We give a survey of known calculations of CEI (categorical enumerative invariants). We also report on some of the recent progresses (joint works with Lino Amorim, and Yefeng Shen) in this direction.

Contact：Yongbin Ruan（ruanyb@zju.edu.cn）

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