With the invitation of Professor Wan-Tong Li of the school of mathematics and statistics of Lanzhou University, Professor Longyun Ding of School of Mathematical Sciences, Nankai University, will visit our school from September 3, 2019 to September 5, 2019 to conduct academic exchanges and make an academic report.

Title： Equivalence relations and Borel reduction

Time：4:30 p.m.，September 4, 2019

Place：Qiyun building, Room 911

Abstract:In Descriptive Set Theory, Borel reduction is a useful tool to characterize the relative complexity of equivalence relations from vary branches in mathematics. In recent years, many logicians worked on this topic and many interesting results were founded. In this talk, we will give a survey on this topic, from the beginning to some brand new results.