with Professor Shoshichi Kobayashi
with Professor Don Chakerian
with Professor Mann and my math-brother Tang
with Professors Pillen and Zhou
with Professor Shiing-Shen Chern
Topologists in China, circa 1980's
Some convex geometers in Halifax, Canada, 1996
Algebraic topology workshop in Beijing University
with Professor J. C. Su (center)
with Professors H. Ku, M. Ku, and Ding
with Professors Brick and Barrionuevo
with Professors Xu and Lin
Differential geometry workshop in Xi'an
Differential geometry workshop in Beijing
Topology workshop in Kai Feng
General topology workshop in Xi'an