Before revision:  We prove that the condition number for the system of algebraic equations resulting from the extended additive average Schwarz method, corresponding to both coarse spaces, is of the order O(H/h) and independent of jumps of the coefficients, where H and h are the mesh parameters.
After revision:  We prove that the condition number for the system of algebraic equations resulting from the extended additive average Schwarz method, corresponding to both coarse spaces, are of the order O(H/h) and independent of jumps of the coefficients, where H and h are the mesh parameters.