Savaş, EkremŞevli, HamdullahRhoades, B. E.2020-11-212020-11-2120090126-6705https://hdl.handle.net/11467/3893A lower triangular infinite matrix is called a triangle if there are no zeros on the principal diagonal. The main result of this paper gives a minimal set of sufficient conditions for a triangle T : A(k) -> A(k) for the sequence space A(k) defined as follows: A(k) := {{s(n)} : (n=1)Sigma(infinity)n(k-1)vertical bar a(n)vertical bar(k) < infinity, a(n) = s(n) - s(n-1)}.eninfo:eu-repo/semantics/closedAccessBounded operatortriangular matricesA(k) spacesweighted mean methodsArticle322223231Q4WOS:000265913500010Q22-s2.0-67949085176