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

Table 1

Superclose results of 𝜓 and 𝑢.

𝑁	‖𝜓ℎ−𝐽ℎ𝜓‖0	Rate	‖𝑢ℎ−Πℎ𝑢‖ℎ	Rate
8^2	0.00210961611276	/	0.00313196226739	/
16^2	5.305340499025525𝑒−004	1.99146324331851	7.857858400185900𝑒−004	1.99485875617198
32^2	1.328284185506180𝑒−004	1.99788150355682	1.966221092417072𝑒−004	1.99871061529750
64^2	3.321927509970684𝑒−005	1.99947134660916	4.916651922457212𝑒−005	1.99967742778650
128^2	8.305579254650728𝑒−006	1.99986789716594	1.229231701395274𝑒−005	1.99991934319524
256^2	2.076442340906698𝑒−006	1.99996697808428	3.073122207277826𝑒−006	1.99997983495344