PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 46(60), pp. 97103 (1989) 

Absolute and ordinary K{ö}theToeplitz duals of some sets of sequences and matrix transformationsEberhard MalkowskyMathematisches Institut, JustusLiebigUniversit{ä}t Iheringstrasse 6, D6300 Giessen, West GermanyAbstract: We determine the ordinary KötheToeplitz dual of the set $\Delta l_\infty(p)$ and the absolute KötheToeplitz duals of the sets $\Delta l_{\infty}(p)$, $\Delta c_0(p)$ and $\Delta c(p)$ defined by Ahmad and Mursaleen. Further we investigate matrix transformations in these spaces and give a characterization of the class $\bigl(\Delta l_\infty(p),l_\infty\bigr)$. Classification (MSC2000): 40H05 Full text of the article:
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