LONG TIME BEHAVIOR OF BACKWARD DIFFERENCE TYPE METHODS FOR PARABOLIC EQUATIONS WITH MEMORY IN BANACH SPACE

We show stability in a Banach space framework of backward Euler and second order backward diierence timestepping methods for a parabolic equation with memory. The results are applied to derive maximum norm stability estimates for piecewise linear nite element approximations in a plane spatial domain, which is accomplished by a new resolvent estimate for the discrete Laplacian. Error estimates are also given.