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Title: Best approximation in a Hilbert space
Authors: Aghdassi, E.
Rzaev, S.F.
Issue Date: 2005
Abstract: In this paper we consider the shift operator on Hilbert spaces and by using this operator we define the modulus of continuity of fractional index, including relation to the K-functional and we prove the fractional analog we direct and inverse theorems of approximation theory.
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