ON ω-CHEBYSHEV SUBSPACES IN BANACH SPACES
ON ω-CHEBYSHEV SUBSPACES IN BANACH SPACES
The purpose of this paper is to introduce and discuss the concept of <TEX>${\omega}$</TEX>-Chebyshev subspaces in Banach spaces. The concept of quasi Chebyshev in Banach space is defined. We show that <TEX>${\omega}$</TEX>-Chebyshevity of subspaces are a new class in approximation theory. In this paper, also we consider orthogonality in normed …