R. Lashkaripour, D. Foroutannia, Dept. of Math., Sistan and Baluchestan University, Zahedan, Iran, e-mail: email@example.com, firstname.lastname@example.org
Abstract: In this paper we consider the problem of finding upper bounds of certain matrix operators such as Hausdorff, Norlund matrix, weighted mean and summability on sequence spaces $l_p(w)$ and Lorentz sequence spaces $d(w,p)$, which was recently considered in  and  and similarly to  by Josip Pecaric, Ivan Peric and Rajko Roki. Also, this study is an extension of some works by G. Bennett on $l_p$ spaces, see  and .
Keywords: inequality, norm, summability matrix, Hausdorff matrix, Norlund matrix, weighted mean matrix, weighted sequence space and Lorentz sequence space
Classification (MSC 2000): 47-99, 15A60
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