Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
842761 | Nonlinear Analysis: Theory, Methods & Applications | 2009 | 6 Pages |
Abstract
We present several sufficient conditions for normal structure of a Banach space in terms of the generalized James, von Neumann–Jordan, Zbăganu constants, and the coefficient of weak orthogonality of Sims. Our results significantly improve many known results in the literatures. A negative answer is given to the question of Llorens–Fuster [E. Llorens-Fuster, Zbganu constant and normal structure, Fixed Point Theory 9 (2008) 159–172].
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Authors
Ji Gao, Satit Saejung,