Geodesic
On positive periodic solutions of first order functional differential equations
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 46 (2015) no. 2, pp. 21-28.

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The periodic boundary value problem for linear functional differential equations is considered. In the case when the Green function changes its sign, conditions for the positiveness of solutions are obtained.
Keywords: functional differential equations, periodic boundary value problem, resonance
Mots-clés : positive solutions. 
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E. I. Bravyi. On positive periodic solutions of first order functional differential equations. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 46 (2015) no. 2, pp. 21-28. http://geodesic.mathdoc.fr/item/IIMI_2015_46_2_a2/

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