On a Riemannian invariant of Chen type

摘要

In [6] we proved Chen's inequality regarded as a problem of constrained maximum. In this paper we introduce a Riemannian invariant obtained from Chen's invariant, replacing the sectional curvature by the Ricci curvature of k-order. This invariant can be estimated, in the case of submanifolds M in space forms (M) over tilde (c), varying with c and the mean curvature of M in (M) over tilde (c).