# American Institute of Mathematical Sciences

October  2014, 19(8): 2447-2459. doi: 10.3934/dcdsb.2014.19.2447

## Existence of unbounded solutions of a linear homogenous system of differential equations with two delays

 1 Department of Mathematics and Descriptive Geometry, Faculty of Civil Engineering and Department of Mathematics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Brno, Czech Republic 2 Department of Mathematics, University of Žilina, Žilina, Slovak Republic, Slovak Republic

Received  October 2013 Revised  May 2014 Published  August 2014

Behavior of solutions of a linear homogeneous system of differential equations with deviating arguments in the form \begin{equation*} \dot y(t)=\beta(t)\left[y(t-\delta)-y(t-\tau)\right] \end{equation*} is discussed for $t\to\infty$. It is assumed that $y$ is an $n$-dimensional column vector, $n\geq 1$ is an integer, $\delta,\tau\in{\mathbb{R}}$, $\tau>\delta>0$, and $\beta(t)$ is an $n\times n$ matrix defined for $t\geq t_{0}$, $t_{0}\in\mathbb{R}$, and such that its elements are nonnegative, continuous functions and in every row of this matrix at least one element is nonzero. The existence of solutions in an exponential form under certain assumptions is proved. Sufficient conditions for the existence of unbounded solutions and the estimations for a solution are derived. A comparison with the known results and an illustrative example are given.
Citation: Josef Diblík, Radoslav Chupáč, Miroslava Růžičková. Existence of unbounded solutions of a linear homogenous system of differential equations with two delays. Discrete & Continuous Dynamical Systems - B, 2014, 19 (8) : 2447-2459. doi: 10.3934/dcdsb.2014.19.2447
##### References:
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##### References:
 [1] O. Arino and M. Pituk, More on linear differential systems with small delays,, J. Diff. Equat., 170 (2001), 381.  doi: 10.1006/jdeq.2000.3824.  Google Scholar [2] F. V. Atkinson and J. R. Haddock, Criteria for asymptotic constancy of solutions of functional differential equations,, J. Math. Anal. Appl., 91 (1983), 410.  doi: 10.1016/0022-247X(83)90161-0.  Google Scholar [3] H. Bereketoǧlu and A. Huseynov, Convergence of solutions of nonhomogeneous linear difference systems with delays,, Acta Appl. Math., 110 (2010), 259.  doi: 10.1007/s10440-008-9404-2.  Google Scholar [4] H. Bereketoǧlu and F. Karakoç, Asymptotic constancy for impulsive delay differential equations,, Dynam. Systems Appl., 17 (2008), 71.   Google Scholar [5] H. Bereketoglu and M. Pituk, Asymptotic constancy for nonhomogeneous linear differential equations with unbounded delays,, Discrete Contin. Dyn. Syst., (2003), 100.   Google Scholar [6] J. Diblík, Asymptotic convergence criteria of solutions of delayed functional differential equations,, J. Math. Anal. Appl., 274 (2002), 349.  doi: 10.1016/S0022-247X(02)00311-6.  Google Scholar [7] J. Diblík, Asymptotic representation of solutions of equation $\dot y(t)=\beta (t)[y(t)-y(t-\tau(t))]$,, J. Math. Anal. Appl., 217 (1998), 200.  doi: 10.1006/jmaa.1997.5709.  Google Scholar [8] J. Diblík, R. Chupáč and M. Růžičková, Unbounded solutions of the equation $\dot y(t)=\sum_{i=1}^n\beta_i(t)[y(t-\delta_i)-y(t-\tau_i)]$,, Appl. Math. Comput., 221 (2013), 610.  doi: 10.1016/j.amc.2013.07.001.  Google Scholar [9] J. Diblík and M. Růžičková, Convergence of the solutions of the equation $\dot y(t)=\beta (t)[y(t-\delta)-y(t-\tau)]$ in the critical case,, J. Math. Anal. Appl., 331 (2007), 1361.  doi: 10.1016/j.jmaa.2006.10.001.  Google Scholar [10] J. Diblík and M. Růžičková, Exponential solutions of equation $\dot y(t)=\beta (t)[y(t-\delta)-y(t-\tau)]$,, J. Math. Anal. Appl., 294 (2004), 273.  doi: 10.1016/j.jmaa.2004.02.036.  Google Scholar [11] J. Diblík, M. Růžičková and Z. Šutá, Asymptotic convergence of the solutions of a discrete system with delays,, Appl. Math. Comput., 219 (2012), 4036.  doi: 10.1016/j.amc.2012.10.040.  Google Scholar [12] I. Györi and L. Horváth, Asymptotic constancy in linear difference equations: Limit formulae and sharp conditions,, Adv. Difference Equ., 2010 (7893).   Google Scholar [13] I. Györi, F. Karakoç and H. Bereketoǧlu, Convergence of solutions of a linear impulsive differential equations system with many delays,, Dyn. Contin. Discrete Impuls. Syst., 18 (2011), 191.   Google Scholar [14] H. L. Smith, Monotone Dynamical Systems. An Introduction to the Theory of Competitive and Cooperative Systems,, Mathematical Surveys and Monographs, (1995).   Google Scholar
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