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 On $w$-Chebyshev subspaces in Banach spaces Bull. Korean Math. Soc. 2008 Vol. 45, No. 3, 601-606 Published online September 1, 2008 Maram Shams, Hamid Mazaheri, and Sayed Mansour Vaezpour Yazd University, Yazd University, Yazd University Abstract : The purpose of this paper is to introduce and discuss the concept of $w$-Chebyshev subspaces in Banach spaces. The concept of quasi Chebyshev in Banach space is defined. We show that $w$-Chebyshevity of subspaces are a new class in approximation theory. In this paper, also we consider orthogonality in normed spaces. Keywords : $w$-Chebyshev subspaces, orthogonality, proximinal subspaces, Chebyshev subspaces MSC numbers : Primary 41A65, 46B50, 46B20, 41A50 Downloads: Full-text PDF