Kayaduman K.Çoşkun H.2024-08-042024-08-0420070420-1213https://doi.org/10.1515/dema-2007-0412https://hdl.handle.net/11616/90658In [6] and [9], the concepts of ?-core and statistical core of a bounded number sequence x have been introduced and also some inequalities which are analogues of Knopp's core theorem have been proved. In this paper, using the concept of ?(A)-summability introduced by Savaş, we characterize the matrices of the classes (m, V?(A)), (c, V?(A))), (V?, VCT?(A)) and (S?m, V?(A))reg and determine necessary and sufficient conditions for a matrix B to satisfy ?(A) -core(Bx) ? K-core(x), ?(A) -core(Bx) ? ? - core(x) and ?(A) - core(Bx) ? st - core(x), for all x ? m. Copyright © 2018 by Walter de Gruyter GmbH.eninfo:eu-repo/semantics/openAccessMatrix transformations and core theoremsStatistically convergence?(A) -convergenceArticle40485986710.1515/dema-2007-04122-s2.0-84862288850Q2