ERROR ESTIMATES FOR FINIT ELEMENT GREEN FUNCTION ON CONCAVE POLYGON
凹角域上Green函数有限元逼近的逐点估计及有限元外推

Using weighted norms we obtain in this paper some estimates of the error of discrete Greenfunction for elliptic boundary value problems on concave polysonal domain. From these re-sults we derive the asympsotic expansion for finite element approximation on convace do-main.