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arXiv 1707.09686math.DG
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等距浸入空间型的凸性、刚性和余维的约化

Convexity, Rigidity, and Reduction of Codimension of Isometric Immersions into Space Forms

Ronaldo F. de Lima, Rubens L. de Andrade

摘要:

本文考虑完备连通黎曼流形到非零常曲率空间型的等距浸入。证明了如果这样的嵌入是紧的且具有半定的第二基本型,则它是余维为1的嵌入,它的像有界于一个凸集,并且它是刚性的.这个结果推广了M.做卡莫和E Lima和M.做卡莫和F.警告者它也肯定地解决了一个猜想做卡莫和华纳。对于满足第二基本型更强条件的完全等距浸入,我们建立了类似的结果。本文将Hadamard关于欧氏超曲面的一个经典定理推广到空间型中的等距浸入。在这同一背景下,我们证明了一个存在性定理的超曲面与指定的边界和消失的高斯-克罗内克曲率。最后,我们证明了等距浸入到空间型,这是经常以外的一组全测地点承认减少余维为一。

英文摘要:

We consider isometric immersions of complete connected Riemannian manifolds into space forms of nonzero constant curvature. We prove that if such an immersion is compact and has semi-definite second fundamental form, then it is an embedding with codimension one, its image bounds a convex set, and it is rigid. This result generalizes previous ones by M. do Carmo and E. Lima, as well as by M. do Carmo and F. Warner. It also settles affirmatively a conjecture by do Carmo and Warner. We establish a similar result for complete isometric immersions satisfying a stronger condition on the second fundamental form. We extend to the context of isometric immersions in space forms a classical theorem for Euclidean hypersurfaces due to Hadamard. In this same context, we prove an existence theorem of hypersurfaces with prescribed boundary and vanishing Gauss-Kronecker curvature. Finally, we show that isometric immersions into space forms which are regular outside the set of totally geodesic points admit a reduction of codimension to one.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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