Alotaibi, Abdullah M.Cakan, Celal2024-08-042024-08-0420121029-242Xhttps://doi.org/10.1186/1029-242X-2012-56https://hdl.handle.net/11616/95873In this article, we have introduced the Riesz convergence and Riesz core of double sequences and determined the necessary and sufficient conditions on a four-dimensional matrix A to yield P-R - core{Ax}. P subset of core{x} and P-R - core{Ax} subset of st(2) - core {x} for all x is an element of l(infinity)(2).eninfo:eu-repo/semantics/openAccessdouble sequencesfour dimensional matricesRiesz meancore theoremsArticle1810.1186/1029-242X-2012-562-s2.0-84870450105Q2WOS:000302901600001Q1