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A global pinching theorem for compact surfaces inS 3 with constant mean curvature
Authors:Hu Zejun  Li Haizhong
Affiliation:(1) Department of Mathematics, Zhengzhou University, 450052 Zhengzhou, China;(2) Department of Applied Mathematics, Tsinghua University, 100084 Beijing, China
Abstract:LetM be a compact minimal surface inS 3. Y. J. Hsu5] proved that if parSpar2le2radic2pgr, thenM is either the equatorial sphere or the Clifford torus, whereS is the square of the length of the second fundamental form ofM, par·par2 denotes theL 2-norm onM. In this paper, we generalize Hsu's result to any compact surfaces inS 3 with constant mean curvature.Supported by NSFH.
Keywords:Compact surface  Constant mean curvature  Global pinching
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