LOWER APPROXIMATION OF EIGENVALUES BY THE NONCONFORMING FINITE ELEMENT METHOD
基于非协调有限元方法的特征值的下界逼近

In this paper,the nonconforming finite element method from is used to discretize the elliptic eigenvalue problem.The error analysis is carried out with the optimal convergence rate.Moreover,it is shown that the approximate eigenvalue is always smaller than the exact one provided that the meshsize is small enough.