On ω-Chebyshev subspaces in Banach spaces

被引：1

作者：

Shams, Maram ^{[1
]}

Mazaheri, Hamid ^{[1
]}

Vaezpour, Sayed Mansour ^{[1
]}

机构：

[1] Yazd Univ, Dept Math, Yazd, Iran

来源：

BULLETIN OF THE KOREAN MATHEMATICAL SOCIETY | 2008年 / 45卷 / 03期

关键词：

omega-Chebyshev subspaces; orthogonality; proximinal subspaces; Chebyshev subspaces;

D O I：

10.4134/BKMS.2008.45.3.601

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

The purpose of this paper is to introduce and discuss the concept of omega-Chebyshev subspaces in Banach spaces. The concept of quasi Chebyshev in Banach space is defined. We show that omega-Chebyshevity of subspaces are a new class in approximation theory. In this paper, also we consider orthogonality in normed spaces.

引用

页码：601 / 606

页数：6

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