The results show that there are clear differences on the "ground","blood" and compositions between the chicken-blood stones and the imitations,which could be used for identification.

The focal points of geodesic submanifold in a complete Riemann manifold;

Sufficient conditions for totally geodesic submanifolds of constantly curved spaces;

Let M n beann dimensional compact minimal submanfold in s n+p (C) with constant curvature c Let K and Q be the infimum of the sectional curvature and Ricci curvature of M n respectively Let R be the scalar curvature of M n and σ be the square of the length of the second fundamental form of M n In this paper, we obtained several sufficient conditions of M n be the totally geodesic submanifol