Geodesic
Summation methods for Fourier series with respect to the Azoff–Shehada system
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 43, Tome 434 (2015), pp. 116-125 
A. Pyshkin. Summation methods for Fourier series with respect to the Azoff–Shehada system. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 43, Tome 434 (2015), pp. 116-125. http://geodesic.mathdoc.fr/item/ZNSL_2015_434_a9/
@article{ZNSL_2015_434_a9,
     author = {A. Pyshkin},
     title = {Summation methods for {Fourier} series with respect to the {Azoff{\textendash}Shehada} system},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {116--125},
     year = {2015},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_434_a9/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

A special class of complete minimal systems with complete biorthogonal system in a Hilbert space is considered. This class was introduced by Azoff and Shehada. The paper studies conditions under which there exists a linear summation method for Fourier series with respect to the Azoff–Shehada system. A construction of a linear summation method of the Fourier series for a given vector is presented, as well as a construction of a universal linear summation method.

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