Pseudo-duals and closeness of continuous $g$-frames in Hilbert spaces

Document Type : Original Article

Authors

Department of Mathematics, University of Qom, Qom, Iran

Abstract

‎The paper deals with pseudo-duals of continuous $g$-frames and their characterizations in Hilbert spaces‎. ‎Mainly‎, ‎the pseudo-duals constructed by bounded operators inserted between the synthesis and analysis operators of the Bessel mappings are considered‎. ‎Duals and approximate duals‎, ‎which are two important classes of pseudo-duals‎, ‎are also studied here‎. ‎Moreover‎, ‎the concepts of closeness and nearness of continuous $g$-frames are focused and some of their properties are obtained‎. ‎It is shown that there are close relationships between the closeness and nearness of $g$-frames and their approximate duals‎. ‎Also‎, ‎the above-mentioned concepts are related to the notions of partial equivalence‎, ‎equivalent frames‎, ‎and continuous Riesz-type $g$-frames.

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