Applied Mathematics Letters, cilt.20, sa.4, ss.359-365, 2007 (SCI-Expanded)
In this paper we shall present a multidimensional invariant Pringsheim core theorem. Conditions on a four-dimensional matrix transformation that will ensure that the transformed Pringsheim core of a bounded double sequence [x] is contained in the double Banach core of [x] shall also be presented. © 2006.