THE ORTHOGONALITY IN THE APPROXIMATION THEOORY

The purpose of this paper is to introduce and discuss the concept of orthogonality in approximation theory. In this note, we shall consider the relation between this concept and the dual X, and obtain some results on the subsets of normed spaces similar to Hilbert spaces.

کلیدواژه ها:

Orthogonality ، proximinal subspaces ، Chebyshev subspaces