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Joint Chinese-Russian Mathematical Online Colloquium

Organizing Committee

  • Huijun Fan (SMS PKU)
    symplectic geometry and mathematical physics, geometric analysis
  • Sergey Gorchinskiy (MI RAS)
    algebra and geometry: algebraic geometry, K-theory
  • Hailiang Li (SMS CNU)
    fluid mechanics, partial differential equations, analysis
  • Jinsong Liu (AMSS)
    algebraic geometry: singularity theory
  • Yi Liu (BICMR)
    Topology of 3-manifolds, 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 semi-classical analysis
  • Alexander Zheglov (MSU)
    geometry: algebraic geometry, integrable system


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 p-divisible groups and p-adic period domains.

Two stratifications in p-adic Hodge theory.

In this talk, we will introduce two Harder-Narasimhan formalisms in p-adic Hodge theory which defines two stratifications: one is called Newton strafication and the other is called Harder-Narasimhan stratification. Newton stratification is the image of the p-adic period mapping and Harder-Narasimhan 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 three-dimensional 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:
Link to lecture 1:
Link to lecture 2:

 The meeting will be held in the form of a webinar on the Voov platform.

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3) However, if you have some difficulties, please, consult to


To Join Tencent Meeting:

Meeting ID:498-2712-5392