Superconvergence of a New Nonconforming Mixed Finite Element Scheme for Elliptic Problem

Table 2

Superconvergence results of 𝜓 and 𝑢.

𝑁	‖𝜓−𝐽2ℎ𝜓ℎ‖0	Rate	‖𝑢−𝐼2ℎ𝑢ℎ‖ℎ	Rate
8^2	0.00438686071544	/	0.00401808068890	/
16^2	0.00109136640979	2.00705335488651	9.832140356840235𝑒−004	2.03092911988780
32^2	2.724757835149567𝑒−004	2.00193562594041	2.445206258258704𝑒−004	2.00754934612234
64^2	6.809546234729317𝑒−005	2.00049744480245	6.105100787093085𝑒−005	2.00186914715453
128^2	1.702238617992853𝑒−005	2.00012537844145	1.525782546054283𝑒−005	2.00046574790862
256^2	4.255503868189354𝑒−006	2.00003141881610	3.814148839722483𝑒−006	2.00011631625361