Abstract
Following work by Casazza, Kutyniok, and Lammers and its development by Stoeva and Christensen, we provide some novel characterizations of R-dual sequences of type III in Hilbert spaces. We systematically extend the construction procedure by basing it on a choice of an antiunitary involution. For certain classes of R-duals of type III, we derive a representation of the associated frame operator in terms of spectral measures.
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The authors would like to thank the referees for valuable comments and suggestions for improvement of the manuscript.
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Translated from Funktsional'nyi Analiz i ego Prilozheniya, 2021, Vol. 55, pp. 62–74 https://doi.org/10.4213/faa3835.
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Führ, H., Cheshmavar, J. & Akbarnia, A. On R-duals of Type III in Hilbert Spaces. Funct Anal Its Appl 55, 226–235 (2021). https://doi.org/10.1134/S0016266321030059
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DOI: https://doi.org/10.1134/S0016266321030059