Academic Editor: L. Górniewicz
Copyright © 2010 Jingxin Zhang and Yunan Cui. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
We show some geometric conditions on a Banach space X concerning the
Jordan-von Neumann constant, Zbăganu constant, characteristic of (separation)
noncompact convexity, and the coefficient R(1, X), the weakly convergent
sequence coefficient, which imply the existence of fixed points for
multivalued nonexpansive mappings.