Journal of Convex Analysis 17 (2010), No. 1, 159--171
Copyright Heldermann Verlag 2010
On the Lower Bounds of Kottman Constants in Orlicz Function Spaces
Z. D. Ren
Department of Mathematics, University of California, Riverside, CA 92521, U.S.A.
jgiu98@hotmail.com
[Abstract-pdf]
Let $L^{(\Phi)}(\Omega)$ and $L^{\Phi}(\Omega)$ be the Orlicz function spaces defined by an $N$-function $\Phi$, equipped with the gauge norm and the Orlicz norm respectively, where $\Omega=[0,1]$ or $[0,\infty)$. The Kottman constants $K(L^{(\Phi)}(\Omega))$ and $K(L^{\Phi}(\Omega))$ were discussed by M. M. Rao and the author in Chapter 5 of their book ``Applications of Orlicz Spaces'' [Marcel Dekker Inc., New York, 2002]. The author obtains some improvments on the lower bounds of these constants in Section 2 (Theorems 1 and 2). Several examples are given in Section 3 which will be used to make comments upon the papers of Y. Q. Yan [On the exact value of packing spheres in a class of Orlicz function spaces, J. Convex Analysis 11(2) (2004) 391--400], and J. Han and X. L. Li [Exact value of packing spheres constant in class of Orlicz function spaces (in Chinese), J. Tongji Univ. 30(7) (2002) 895--899].
Keywords: Orlicz function space, Kottman constant and packing constant.
MSC: 46B30
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