3.The Distinct Element Method(DEM)is a discontinuum-based numerical method especially applicable to solve the discontinuity problems in jointed rock mass.
5.A class of nonconforming finite elements are applied to hyperbolic equation with semidiscretization on anisotropic meshes, the optimal error estimates are derived.
7.This paper presents and proves a discriminant theorem which is suited to examine the determinability of the discrete linear system,which shows that an outstanding issue of this field has been solved.