摘要
对于抛物型问题采用Ｐｅｔｒｏｖ－Ｇａｌｅｒｋｉｎ方法，借助于内插后处理、外推法和盈亏校正等技巧得到了高精度的有限元近似解．
In this paper we employ the Petrov Galerkin method for the parabolic problems to get the finite element approximate solution of high accuracy by means of the interpolation postprocessing, extrapolation and defect correction techniques.
