A Lower Bound of the First Dirichlet Eigenvalue of a Compact Manifold   with Positive Ricci Curvature
  We give a new estimate on the lower bound for the first Dirichlet eigenvalue for a compact manifold with positive Ricci curvature in terms of the in-diameter and the lower bound of the Ricci curvature. The result improves the previous estimates. 
Jun Ling