Pituk, Mihály: A Perron type theorem for positive solutions of functional differential equations. In: Electronic journal of qualitative theory of differential equations : special edition, (3) 57. pp. 111. (2018)

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Abstract
A nonlinear perturbation of a linear autonomous retarded functional differential equation is considered. According to a Perron type theorem, with the possible exception of small solutions the Lyapunov exponents of the solutions of the perturbed equation coincide with the real parts of the characteristic roots of the linear part. In this paper, we study those solutions which are positive in the sense that they lie in a given order cone in the phase space. The main result shows that if the Lyapunov exponent of a positive solution of the perturbed equation is finite, then it is a characteristic root of the unperturbed equation with a positive eigenfunction. As a corollary, a necessary and sufficient condition for the existence of a positive solution of a linear autonomous delay differential equation is obtained.
Item Type:  Article 

Journal or Publication Title:  Electronic journal of qualitative theory of differential equations : special edition 
Date:  2018 
Volume:  3 
Number:  57 
ISSN:  14173875 
Page Range:  pp. 111 
Uncontrolled Keywords:  Differenciálegyenlet, Perron tétel 
Additional Information:  Bibliogr.: p. 1011. ; Összefoglalás angol nyelven 
Date Deposited:  2018. Nov. 07. 09:58 
Last Modified:  2018. Nov. 07. 13:55 
URI:  http://acta.bibl.uszeged.hu/id/eprint/55727 
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