演讲者:Kestutis Cesnavicius(巴黎萨克雷大学)
时间:2022-06-15 15:30-16:30
地点:Zoom ID: 967 248 8008, Passcode: available upon demand
Abstract: A conjecture of Nisnevich predicts that for a smooth variety X over a field, a smooth divisor D in X, and a totally isotropic reductive X-group scheme G, every generically trivial G-torsor on X \ D trivializes Zariski locally on X. I will discuss this conjecture and related questions about torsors under reductive groups over regular rings.
Ref: K.Cesnavivius, The Bass-Quillen phenomenon for reductive group torsors