SOME RELATIONS BETWEEN DIFFERENTIAL ... - Project Euclid
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SOME RELATIONS BETWEEN DIFFERENTIAL ... - Project Euclid
The equality sign of (3.1) holds when and only .... The equality sign of (4.2) holds when and only when M is in â l)-pin- ching in Em. ... Michigan State University.
Bang-yen Chen Nagoya Math. J . Vol. 60 (1976), 1-6
SOME RELATIONS BETWEEN DIFFERENTIAL GEOMETRIC INVARIANTS AND TOPOLOGICAL INVARIANTS OF SUBMANIFOLDSυ BANG-YEN CHEN2) § 1. Introduction. Let M be an n-dimensional manifold immersed in an m-dimensional euclidean space Em and let V and V be the covariant differentiations of M and Em, respectively. Let X and Y be two tangent vector fields on M. Then the second fundamental form h is given by (1.1)
VΣY = VXY + h(X, Y) .
It is well-known that h(X, Y) is a normal vector field on M and it is symmetric on X and Y. Let ξ be a normal vector field on M, we write (1.2)
Pxξ = -Aξ{X) + Dxξ ,
where — Aξ(X) and DΣξ denote the tangential and normal components of Then we have (1.3)
—1, the submanifolds with large homology groups must have large total mean curvature. § 2. Basic formulas. Let ξ be a unit normal vector field on M. We define the i-th mean curvature Kt{ξ) at ξ by
(2.1)
det(/ + tAξ) = l + ±(n W i=i
,
\ ^ /
where / is the identity transformation of the tangent spaces of Jlί,ί a parameter and (n. j = nϊ/i\(n — i)\.
