Abstract
We describe all pairs of linear continuous operators that act in the spaces of functions analytic in domains and satisfying an operator analog of the cosine addition theorem.
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Translated from Ukrains’kiĭ Matematychnyĭ Visnyk, Vol. 11, No. 1, pp. 69–78, January–February, 2014.
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Linchuk, Y.S. On an operator analog of the cosine addition theorem. J Math Sci 200, 345–351 (2014). https://doi.org/10.1007/s10958-014-1916-x
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DOI: https://doi.org/10.1007/s10958-014-1916-x