Abstract
We prove theorems on the extension of even-positive-definite functions from a finite interval to the entire axis and from a strip onto the entire plane.
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References
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 51, No. 11, pp. 1577–1581, November, 1999.
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Lopotko, O.V. On the extension of even-positive-definite functions of one and two variables. Ukr Math J 51, 1782–1786 (1999). https://doi.org/10.1007/BF02525265
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DOI: https://doi.org/10.1007/BF02525265