# 文理学院数学报告（来米加研究员和华波波副研究员）

This is a joint work with Xuzhang Chen and Fang Wang.

Besides spherical tilings, we consider spherical polyhedral surfaces with curvature at least one in the sense of Alexandrov. We show that
the volume of such a surface is less than 4pi-c, for some explicit constant c>0. This is a joint work with Yohji Akama and Yanhui Su.