Pre-Frame Operators, Besselian Frames, and Near-Riesz Bases in Hilbert Spaces
Pre-Frame Operators, Besselian Frames, and Near-Riesz Bases in Hilbert Spaces
A problem of enduring interest in connection with the study of frames in Hubert space is that of characterizing those frames which can essentially be regarded as Riesz bases for computational purposes or which have certain desirable properties of Riesz bases.In this paper we study several aspects of this problem …