Abstract
We obtain conditions for the existence and smoothness of invariant tori of countable systems of differential equations with delay.
References
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Institute of Mathematics, Ukrainian Academy of Sciences, Kiev. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 51, No. 9, pp. 1292–1295, September, 1999.
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Samoilenko, A.M., Él'nazarov, A.A. On invariant tori of countable systems of differential equations with delay. Ukr Math J 51, 1454–1458 (1999). https://doi.org/10.1007/BF02593012
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DOI: https://doi.org/10.1007/BF02593012