# Uniform convexity in $\ell_{p(\cdot)}$

Volume 10, Issue 10, pp 5292--5299

Publication Date: 2017-10-20

http://dx.doi.org/10.22436/jnsa.010.10.15

### Authors

Mostafa Bachar - Department of Mathematics, College of Sciences, King Saud University, Riyadh, Saudi Arabia
Messaoud Bounkhel - Department of Mathematics, College of Sciences, King Saud University, Riyadh, Saudi Arabia
Mohamed A. Khamsi - Department of Mathematical Sciences, University of Texas at El Paso, El Paso, TX 79968, USA

### Abstract

In this work, we investigate the variable exponent sequence space $\ell_{p(\cdot)}$. In particular, we prove a geometric property similar to uniform convexity without the assumption $\limsup_{n \to \infty} p(n) < \infty$. This property allows us to prove the analogue to Kirk's fixed point theorem in the modular vector space $\ell_{p(\cdot)}$ under Nakano's formulation.

### Keywords

Fixed point, modular vector spaces, nonexpansive mapping, uniformly convex, variable exponent spaces