PROGRAM
11:00 (GMT+3)
Junwu Tu ShanghaiTech University https://ims.shanghaitech.edu.cn/2018/1110/c4741a35982/page.htm 

Биография: Junwu Tu is a Professor at the Insitute of Mathematical Sciences of ShanghaiTech University. He got his bachelor’s degree from Nanjing University in 2005 and Ph.D. from the University of WisconsinMadison in 2011. His research centers around homological algebra and its applications in algebraic geometry, symplectic geometry, homological mirror symmetry and data sciences. Recently, he has been working on defining and understanding categorical GromovWitten invariants. 
Frobenius structures from CalabiYau categories.
Primitive forms were introduced by K. Saito in his construction of period mapping in the unfolding space of singularities. The Hodge theoretic structure involved in this construction is known as the semiinfinite Hodge structure introduced by Barannikov and Kontsevich. Following Kontsevich’s proposal in his 1994 ICM address, we shall discuss the appearance of such structures in the categorical contexts, as well as a few open problems in this direction.
12:00 (GMT+3)
Sabir M. GuseinZade Lomonosov Moscow State University 

Bio: Sabir Medzhidovich GuseinZade is a Professor at the Department of Higher Geometry and Topology of Lomonosov Moscow State University. He graduated from the Faculty of Mechanics and Mathematics of MSU in 1974 and defended his PhD thesis under the supervision of Sergei Novikov in 1975. In 1991, GuseinZade became Doctor of Physical and Mathematical Sciences. GuseinZade has been the faculty of the Department of Higher Geometry and Topology since 1996. His scientific interests include the theory of singularities and the topology of algebraic spaces. Prof. GuseinZade is the author of more than 120 publications on pure and applied mathematics (including 4 monographs). He is also the editor of the Moscow Mathematical Journal and has been the Secretary of the Moscow Mathematical Society since 1996. 
Noncommutative analogue of the BerglundHübschHenningson duality and symmetries of orbifold invariants of singularities.
The first regular construction of (conjecturally) mirror symmetric orbifolds belongs to Berglund, Hübsch and Henningson. The BerglundHübschHenningson (BHH for short) duality is a duality on the set of pairs (f,G) consisting of an invertible polynomial group and a subgroup G of diagonal symmetries of f. Symmetries of (orbifold) invariants of BHHdual pairs are related to mirror symmetry. There were prooved symmetries for the orbifold Euler characteristic, orbifold monodromy zetafunction, and orbifold Efunction. One has a method to extend the BBHduality to the set of pairs (f,G^, where G^ is the semidirect product of a group G of diagonal symmetries of f and a group S of permutations of the coordinates preserving f. The construction is based on ideas of A.Takahashi and therefore is called the BerglundHübschHenningsonTakahashi (BHHT) duality. Invariants of BHHTdual pairs have symmetries similar to mirror ones only under some restrictions on the group S: the socalled parity condition (PC). Under the PCcondition it is possible to prove some symmetries of the orbifold invariants of BHHTdual pairs.
The talk is based on joint results with W.Ebeling.
The meeting will be held in the form of a webinar on the Zoom platform.
Preregistration for the event is not required.
Link to the conference:
https://us02web.zoom.us/j/84065324254?pwd=SHV3YnBncS85Tmh4bXhkV29pZHh0dz09
Meeting ID : 840 6532 4254
Passcode：987654