Mean curvature flow of hypersurfaces in Einsteinnian manifold

Huisken proved that any hypersurface M0 satisfying a suitable convexity conditionin a Riemannian manifold contracts to a simple point during the evolution along its meancurvature vector. In this letter the author studies the evolution of hypersurfaces in a posi-tive pinched Einsteinnian manifold Nn+1 without assuming the convexity of initialhypersurface M0 and obtains the same convergent result.