No abstract

We call KABCD, its contractions KAC = EB K ABCB and K = Y

No abstract

We consider in this note the following question: given a closed Riemann n -manifold of constant scalar curvature, how can it be minimally immersed in the round (n + 1)-sphere? Our main result states that the immersion has to be isoparametric if the number of its distinct principal curvatures is three identically. This provides another piece of supporting evidence to a conjecture of Chern.

No abstract