s-Regular Matrices and a s-Core Theorem for Double Sequences

The famous Knopp Core of a single sequence was extended to the Pcore of a double sequence by R. F. Patterson. Recently, the MR-core and σ-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 σ-cores

Keywords:

Double sequences Invariant means, Core theorems and matrix transformations, 2000 AMS Classification: 40 C 05,

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