Periodic solutions for scalar functional differential equations

Suf ficient criteria are established f or the existence ofpositive periodic solutions ofscalar f tional differential equations, which improve and generalize some related results in the literature. The approach is based on the Krasnoselskii’s fixed point theorem. Numerical simulations are presented to support the analytical analysis. 2005 Elsevier Ltd. All rights reserved. MSC: 34K13; 92D25

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