Department of Mathematics, Zhengzhou University, Zhengzhou, 450052, Henan, People's Republic of China ; Department of Mathematics, Sichuan University, Chengdu, 610064, Sichuan, People's Republic of China
Abstract:
In this paper, we transform the problem of determining isometric immersions from into into that of solving a degenerate Monge-Ampère equation on the unit disc. By presenting one family of special solutions to the equation, we obtain a great many noncongruent examples of such isometric immersions with or without umbilic set.