[BIMSA Topology Seminar] Chow-Witt groups and Milnor-Witt motives


Speaker:    Nanjun Yang

Date:    2022.09.19     

Time:    15:30-17:00

Venue:  BIMSA 1129B

Zoom:    537 192 5549 (PW: BIMSA)



Chow-Witt group is the quadratic refinement of Chow group which applies to classifications of vector bundles, Hermitian K-theory and refined enumerative geometry.
In this talk, we explain how to derive Chow-Witt group from the question of finding nowhere vanishing sections of vector bundles. Then we interpret the motivic method to compute Chow-Witt groups and how Bockstein SS is naturally involved, including the computation of fiber bundles and blowups.