期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：1997
卷号：20
DOI：10.1155/S0161171297000690
出版社：Hindawi Publishing Corporation
摘要：For both ordinary convergence and ℓ1-summability explicit sufficient conditions on a
matrix have long been known that ensure that the summability method is strictly stronger than the identity
map. The main results herein show that a matrix that satisfies those conditions can be included by
another matrix only if the other matrix satisfies those same conditions.
