On well posedness of best simultaneous approximation problems in Banach spaces

被引：0
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作者：
Li, Chong [1 ]
机构：
[1] Department of Applied Mathematics, Southeast University, Nanjing 210096, China
来源：
Science in China, Series A: Mathematics, Physics, Astronomy | 2001年 / 44卷 / 12期
基金：
中国国家自然科学基金;
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摘要：
The well posedness of best simultaneous approximation problems is considered. We establish the generic results on the well posedness of the best simultaneous approximation problems for any closed weakly compact nonempty subset in a strictly convex Kadec Banach space. Further, we prove that the set of all points in E(G) such that the best simultaneous approximation problems are not well posed is a σ-porous set in E(G) when X is a uniformly convex Banach space. In addition, we also investigate the generic property of the ambiguous loci of the best simultaneous approximation.
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页码：1558 / 1570
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