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Let be the given trigonometric series, then the formal product of them is defined by where the last series is supposed to be convergent for every n.
[1]Zygmund, A., Trigonometric series, Chapter IX (Cambridge University Press, 1959).Google Scholar
[2]
[2]Zygmund, A., ‘A theorem on the formal multiplication of trigonometric series’, Functional Analysis and Related Fields (Proc. Conf, for M. Stone, Univ. Chicago, Chicago, Illinois, (1968), 224–227 Springer, New York, 1970).Google Scholar