Codimension two submanifolds of positive curvature

Moore, John Douglas

doi:10.1090/S0002-9939-1978-0487560-8

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ISSN 1088-6826(online) ISSN 0002-9939(print)

Codimension two submanifolds of positive curvature

Author: John Douglas Moore
Journal: Proc. Amer. Math. Soc. 70 (1978), 72-74
MSC: Primary 53C40; Secondary 58E99
MathSciNet review: 487560
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Abstract: In this note it is proven that a compact connected n-dimensional Riemannian manifold of positive curvature, isometrically immersed in -dimensional Euclidean space, is a homotopy sphere if $n \geqslant 3$ ; hence it is homeomorphic to a sphere if $n \geqslant 5$ .

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