Geodesic
Characterizations of $L^1$-predual spaces by centerable subsets
Commentationes Mathematicae Universitatis Carolinae, Tome 48 (2007) no. 2, pp. 239-243.

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In this note, we prove that a real or complex Banach space $X$ is an $L^1$-predual space if and only if every four-point subset of $X$ is centerable. The real case sharpens Rao's result in [{\it Chebyshev centers and centerable sets\/}, Proc. Amer. Math. Soc. {\bf 130} (2002), no. 9, 2593--2598] and the complex case is closely related to the characterizations of $L^1$-predual spaces by Lima [{\it Complex Banach spaces whose duals are $L_1$-spaces\/}, Israel J. Math. {\bf 24} (1976), no. 1, 59--72].
Classification : 41A65, 46B20
Keywords: Chebyshev radius; centerable subsets and $L^1 $-predual spaces 
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Duan, Yanzheng; Lin, Bor-Luh. Characterizations of $L^1$-predual spaces by centerable subsets. Commentationes Mathematicae Universitatis Carolinae, Tome 48 (2007) no. 2, pp. 239-243. http://geodesic.mathdoc.fr/item/CMUC_2007__48_2_a5/