有限元超收敛的研究始于1972年,有关它的历史以及参考文献,可见.当网格剖分比较好且精确解满足一定的正则性条件时,有些混合元具有超收敛性,但这些研究都是基于对剖分的正则性条件或拟一致假设,
In semidiscrete scheme,the convergence analysis of the Berandi-Raugel mixed finite element approximation to the Stokes type integro-differential equations is presented on anisotropic meshes.At the same time,the superclose property and global superconvergence for the approximation solution of velocity in H~1-norm are derived through integral identity and interpolation postprocessing techniques. Comparing with error estimates of the general finite element methods,the convergence rate is increased by one order.