Xuất bản mới
Nguyễn Hữu Sáu, Piyapong Niamsup, Vũ Ngọc Phát, Linear Programming Approach to Constrained Stabilization of Positive Differential-Difference Equations With Unbounded Delay, Optimal Control Applications and Methods, 2025; 46:2581--2594 (SCI-E, Scopus) .
Đỗ Hoàng Sơn, Vũ Đức Việt, Quantitative stability for the complex Monge-Ampère equations II, Calculus of Variations and Partial Differential Equations 64 (2025), no. 8, Paper No. 269 (SCI-E, Scopus) .
Giang Trung Hiếu, Existence and uniqueness results for a nonlinear Budiansky-Sanders shell model, Journal of Engineering Mathematics, Volume 151, article number 5, (2025) (SCI-E, Scopus) .

Grothendieck-Serre and Purity of torsors

Người báo cáo: Ning Guo

Thời gian: 16h30 - 18h00, thứ 5 ngày 19 tháng 10.

Hình thức: Offline tại phòng 612 A6 và online qua google meet, cụ thể https://meet.google.com/yep-kbzk-eao?pli=1&authuser=1

Tóm tắt: Torsors (or principal bundles) are generalization of vector bundles and they are basic objects of geometry and physics. A long-standing conjecture proposed by Grothendieck and Serre predicts that over a regular local ring, every generically trivial torsor under a reductive group scheme is trivial. The state of the art is the equi-characteristic case proved by Panin and Fedorov-Panin, the quasi-split unramified case by Cesnavicius, and the unramified case when the group scheme is constant by Guo-Liu and Guo-Panin-Stavrova. In this talk, I will introduce the Grothendieck-Serre conjecture, discuss several geometric methods (including presentation theorems and analysis of torsors over affine line), and its relation with purity.