On the exceptional case in systems of non-linear differential equations
Rahmi Ibrahim Ibrahim Abdel Karim (1971)
Archivum Mathematicum
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Rahmi Ibrahim Ibrahim Abdel Karim (1971)
Archivum Mathematicum
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Zdzisław Wyderka (1996)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
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Alexander Fischer (2004)
Applications of Mathematics
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The present paper does not introduce a new approximation but it modifies a certain known method. This method for obtaining a periodic approximation of a periodic solution of a linear nonhomogeneous differential equation with periodic coefficients and periodic right-hand side is used in technical practice. However, the conditions ensuring the existence of a periodic solution may be violated and therefore the purpose of this paper is to modify the method in order that these conditions...
Stanisław Sȩdziwy (2009)
Bollettino dell'Unione Matematica Italiana
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The note presents a simple proof of a result due to F. Obersnel and P. Omari on the existence of periodic solutions with an arbitrary period of the first order scalar differential equation, provided equation has an n-periodic solution with the minimal period n > 1.
Bahman Mehri (1977)
Archivum Mathematicum
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