SUBMANIFOLDS IN S~(n+p) WITH PARALLEL MBIUS FORM |
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作者姓名: | Xia QiaolingDept.of Math. Zhejiang Univ. Hangzhou China. |
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作者单位: | Xia QiaolingDept.of Math.,Zhejiang Univ.,Hangzhou 310027,China. |
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基金项目: | the National Natural Science Foundation of China ( 1 0 2 71 1 0 6) ,the Natural ScienceFoundation of Zhejiang Province ( M1 0 30 4 7) and the Education Department of Zhejiang Province( 2 0 0 30 342 ) |
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摘 要: | § 1 IntroductionLet x:M→ Sn+p be an n-dimensional submanifold in the unit sphere without umbilicpoints.Let { ei} be a local orthonormal basis with respectto the firstfundamental form I=dx·dx with dual basis{ θi} .Let II =∑ijαhαijθiθjeαbe the second fundamental form of xand H =∑αHαeαbe the mean curvature vector of x,where we use the range of indices:1≤ i,j,k,l≤ n, n + 1≤α,β,γ≤ n + p,Hα=1n∑ihαij,{ eα} is a local orthonormal basis forthe normal bundle ofx.We defi…
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