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Öğe ?-regular matrices and a ?-core theorem for double sequences(Hacettepe University, 2009) Çakan C.; Altay B.; Coskun H.The famous Knopp Core of a single sequence was extended to the P-core of a double sequence by R.F. Patterson. Recently, the MR-core and ?-core of real bounded double sequences have been introduced and some inequalities analogues to those for Knoop's Core Theorem have been studied. The aim of this paper is to characterize a class of four-dimensional matrices, and so to obtain necessary and sufficient conditions for a new inequality related to the P- and ?-cores.