Abstract
The equation d2x/dt2=Ax +f(t, x) is considered in a Banach space E, where A is a fixed unbounded linear operator, andf(t, x) is a nonlinear operator which is periodic in t and satisfies a Lipschitz condition with respect to x ε E. Existence conditions have been obtained for a well defined generalized periodic solution of this equation, and also when this solution coincides with the true solution. Similar results have been obtained for the first order equation.
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Translated from Matematicheskie Zametki, Vol. 4, No. 1, pp. 105–112, July, 1968.
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Medvedev, N.V. An existence principle for a periodic solution of a differential equation in Banach space. Mathematical Notes of the Academy of Sciences of the USSR 4, 551–554 (1968). https://doi.org/10.1007/BF01429820
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DOI: https://doi.org/10.1007/BF01429820