Speaker Biography:Ren Jinbo is a professor at the School of Mathematical Sciences at Xiamen University. He earned his Ph.D. from the University of Paris XI in France and completed postdoctoral research at the University of Virginia and the Institute for Advanced Study in Princeton, USA. Professor Ren's research focuses on Diophantine problems and the properties of arithmetic groups, with his work published in renowned journals such as *Inventiones Mathematicae* and *Compositio Mathematica*.