Title: Positivity of the canonical basis under the comultiplication

Speaker: Zhaobing Fan（Harbin Engineering University）

Time: 9.19 (Friday), 16:00-17:00 

Venue: Gewu Building 315

Abstract ：We show the positivity of the canonical basis for a modified quantum affine sl_n and modified i-quantum groups under the comultiplication. This is a joint work with Yiqiang Li.