AMIYA K. PANI AND RAJEN K. SINHA
The purpose of this paper is to show how known negative norm estimates and superconvergence results applied to parabolic equations can be carried over to integro-differential equations of parabolic type. A quasi projection technique introduced earlier by Douglas, Dupont and Wheeler is modified to establish negative norm estimates in several space variables. Further, in a single space variable, knot superconvergence is also established. Finally, interior superconvergence estimates are also derived.