# HOẠT ĐỘNG TRONG TUẦN

Shokurov's conjecture on conic bundles with canonical singularities
 Speaker: Prof. Jingjun Han (John Hopkins)Time: 8h00, Friday, August 27, 2021 Zoom Meeting https://us02web.zoom.us/j/82772292046?pwd=Yyt5ZkpXa1AyNnlnbnk5VTdxVGkvZz09 Meeting ID: 827 7229 2046 Passcode: 830392 Abstract: A conic bundle is a contraction $Xto Z$ between normal varieties of relative dimension $1$ such that the anit-canonical divisor is relatively ample. In this talk, I will prove a conjecture of Shokurov which predicts that, if $Xto Z$ is a conic bundle such that $X$ has canonical singularities, then base variety $Z$ is always $frac{1}{2}$-lc, and the multiplicities of the fibers over codimension $1$ points are bounded from above by $2$. Both values $frac{1}{2}$ and $2$ are sharp. This is a joint work with Chen Jiang and Yujie Luo.

### Tin tức nổi bật

 02/12/22, Hội nghị, hội thảo:International Conference on Discrete Mathematics and Computer Science (ICDMCS) 05/12/22, Hội nghị, hội thảo:Winter School on Mathematical Models and Dynamical Systems 16/12/22, Bài giảng viện:Arational blowdown surgery on 4-manifolds 19/12/22, Hội nghị, hội thảo:Một số vấn đề trong hình học và tô pô 08/08/23, Hội nghị, hội thảo:Đại hội Toán học Việt Nam lần thứ X