سال انتشار: ۱۳۸۶

محل انتشار: سی و هشتمین کنفرانس ریاضی ایران

تعداد صفحات: ۳

نویسنده(ها):

HAMID MAZAHERI – Department of Mathematics, Yazd University, Iran

چکیده:

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.