The Mean Curvature of the Second Fundamental Form of a hypersurface
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An expression for the first variation of the area functional of the second fundamental form is given for a hypersurface in a semi-Riemannian space. The concept of the "mean curvature of the second fundamental form" is then introduced. Some characterisations of extrinsic hyperspheres in terms of this curvature are given.
25 pages; 2 figures. As compared to previous versions only minor corrections have been made. A shorter version of this article is accepted for publication in Beiträge zur Algebra und Geometrie
25 pages; 2 figures. As compared to previous versions only minor corrections have been made. A shorter version of this article is accepted for publication in Beiträge zur Algebra und Geometrie