A Two-Level Additive Schwarz Preconditioning Algorithm for the Weak Galerkin Method for the Second-Order Elliptic Equation

Table 1

The iteration numbers of the PCG and CG.

	1/8	1/16	1/32	1/64	1/128
PCG (/ = 1)	10	11	11	11	12
PCG (/ = 2)	14	15	15	16	16
CG	60	119	231	436	864