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
Double sequences Invariant means Core theorems and matrix transformations 2000 AMS Classification: 40 C 05
Primary Language | English |
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Subjects | Statistics |
Journal Section | Mathematics |
Authors | |
Publication Date | January 1, 2009 |
Published in Issue | Year 2009 Volume: 38 Issue: 1 |