# On Some Uniform Convexities and Smoothness in Certain Sequence Spaces

### Yunan Cui

University of Science and Technology, Harbin, China### Henryk Hudzik

Adam Mickiewicz University, Poznan, Poland### Ryszard Pluciennik

Adam Mickiewicz University, Poznan, Poland

## Abstract

It is proved that any Banach space $X$ with property $A_{2}$ has property $A_{2}$ and that a Banach space $X$ is nearly uniformly smooth if and only if it is nearly uniformly *- smooth and weakly sequentially complete. It is shown that if $X$ is a Köthe sequence space the dual of which contains no isomorphic copy of $l_{1}$ and has property $A_{2}$, then $X$ has the uniform Kadec-Klee property. Criteria for nearly uniformly convexity of Musielak-Orlicz spaces equipped with the Orlicz norm are presented. It is also proved that both properties nearly uniformly smoothness and nearly uniformly convexity for Musielak-Orlicz spaces equipped with the Luxemburg norm coincide with reflexivity. Finally, an interpretation of those results for Nakano spaces $l_{(p_{i})}(1<p_{i}<∞)$ is given.

## Cite this article

Yunan Cui, Henryk Hudzik, Ryszard Pluciennik, On Some Uniform Convexities and Smoothness in Certain Sequence Spaces. Z. Anal. Anwend. 17 (1998), no. 4, pp. 893–905

DOI 10.4171/ZAA/857