Directory UMM :Journals:Journal_of_mathematics:EJQTDE:
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A number of papers were devoted to an analogous problem for deviated differential equations and systems of ordinary differential equations (see [2]–[6]). As to systems of de-
The above-mentioned propositions strengthen the earlier results on pe- riodic solutions of systems of ordinary differential equations and functional differential equations of
The theory of generalized ordinary differential equations enables one to inves- tigate ordinary differential, difference and impulsive equations from the unified standpoint...
they applied the criteria to show the existence of periodic and almost periodic solutions for some partial functional differential equations with infinite delay and some
Burton, Stability and Periodic Solutions of Ordinary and Functional Differ- ential Equations , Academic Press, Orlando, Florida, 1985..
Introducing shift operators on time scales we construct the integro-dynamic equa- tion corresponding to the convolution type Volterra differential and difference equations in
By using the Hopf’s bifurcation theorem and the above mentioned result, we will discuss the existence of small amplitude periodic solutions of equation (1.1), taking as
The symmetry group of the cylindrical Laplace equation has not any nonconstant ordinary differential invariants, i.e., it does not have any differential invariants of order zero,
