Organizing Committee
 Huijun Fan (SMS PKU)
symplectic geometry and mathematical physics, geometric analysis  Sergey Gorchinskiy (MI RAS)
algebra and geometry: algebraic geometry, Ktheory  Hailiang Li (SMS CNU)
fluid mechanics, partial differential equations, analysis  Jinsong Liu (AMSS)
algebraic geometry: singularity theory  Yi Liu (BICMR)
Topology of 3manifolds, hyperbolic geometry  Denis Osipov (MI RAS)
algebraic geometry, number theory, integrable system  Ye Tian (UCAS, AMSS)
Number Theory, Arithmetic Geometry, Iwasawa Theory  Alexey Tuzhilin (MSU)
geometry: Riemannian and metric geometry  Yue Yang (CE PKU)
computation mathematics and mechanics  Ping Zhang (AMSS)
P. D. E.: fluid equation and semiclassical analysis  Alexander Zheglov (MSU)
geometry: algebraic geometry, integrable system
PROGRAM
11:00 (GMT+3)
Miaofen Chen East China Normal University 

Bio: Miaofen Chen is currently a Professor at East China Normal University. In 2011, she received her PhD from Unversity of Paris XI. After graduation, she worked at Bonn university and Technical University of Munich as a postdoctoral fellow. Miaofen Chen joined East China Normal University since 2012. She studies various problems related to moduli space of pdivisible groups and padic period domains. 
Two stratifications in padic Hodge theory.
In this talk, we will introduce two HarderNarasimhan formalisms in padic Hodge theory which defines two stratifications: one is called Newton strafication and the other is called HarderNarasimhan stratification. Newton stratification is the image of the padic period mapping and HarderNarasimhan stratification is its algebraic approximation. In this talk, we will explain the basic properties of these two stratifications and their relations.
12:00 (GMT+3)
Andrey Trepalin Steklov Mathematical Institute of RAS 

Bio: Andrey Trepalin graduated from the Faculty of Mechanics and Mathematics of Lomonosov Moscow State University in 2010 and obtained his PhD at Institute for Information Transmission Problems in 2014 in Moscow. Then he was a scientific researcher in Institute for Information Transmission Problems. Now he is a scientific researcher in the Department of Algebra of Steklov Mathematical Institute of RAS and in the Laboratory of Algebraic Geometry of Higher School of Economics in Moscow. His research interests are in algebraic geometry, especially birational geometry. 
Quotients of pointless del Pezzo surfaces of degree 8.
In the talk we will consider del Pezzo surfaces of degree 8 over algebraically nonclosed fields of characteristic 0. Any quadric surface in threedimensional projective space is a del Pezzo surface of degree 8, and it is well known that such surface can be pointless. We want to study birational classification of quotients of pointless del Pezzo surfaces of degree 8 by finite automorphism groups. In particular, we want to find conditions on the surface and the group for which the quotient can be not rational over the main field. We will show that the quotient by any group of odd order is birationally equivalent to the original surface, and the quotient by any group of even order is birationally equivalent to a quadric surface.
Link to colloquium: https://www.srmc.pku.edu.cn/xzyj/kylt/153995.htm
Link to lecture 1: https://www.srmc.pku.edu.cn/rl/155314.htm
Link to lecture 2: https://www.srmc.pku.edu.cn/rl/155316.htm
The meeting will be held in the form of a webinar on the Voov platform.
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