通过投影型插值展开,在解不光滑时(u∈H^1或H^2),定义一种新的误差,并利用此误差研究双线性元非光滑解的超收敛性。
By using projection type interpolation expansion, a new kind of error at the condition of non-smooth solution is defined. (u∈H^1 orH^2). And then the superconvergence of bilinear rectangular finite element with nonsmooth solution is discussed.