报告题目：Studies of differences from the point of view of Nevanlinna theory

报告人：郑建华，清华大学数学系教授，博士生导师

报告时间：2022年3月21日  19:30-20:30

报告地点：腾讯会议：916-152-657

会议密码：22321

主持人：乔守红

报告摘要：This talk consists of three parts. First, we give so far the best condition under which the shift invariance of the counting function, and of the characteristic of a subharmonic function, holds. Second, a difference analogue of logarithmic derivative of a δ-subharmonic function is established allowing the case of hyper-order equal to one and minimal hyper-type, which improves the condition of the hyper-order less than one. Finally, we make a careful discussion of a well-known difference equation and give the possible forms of the equation under a growth condition for the solutions.

报告人简介：郑建华，清华大学数学系教授，博士生导师主要研究复动力系统，亚纯函数理论以及遍历论和熵理论。主持承担多项国家自然科学基金，并在 J. London Math. Soc.,  Transaction AMS.,  Math. Z., Nonlinearily,Bull. London Math. Soc., 等国际著名期刊发表论文70余篇，出版2本学术专著。