# American Institute of Mathematical Sciences

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August  2020, 25(8): 3171-3181. doi: 10.3934/dcdsb.2020056

## Global attraction in a system of delay differential equations via compact and convex sets

 Departamento de Estatística, Análise Matemática e Optimización and Instituto de Matemáticas, Universidade de Santiago de Compostela, Facultade de Matemáticas, Campus Vida, 15782 Santiago de Compostela, Spain

Received  May 2019 Published  August 2020 Early access  February 2020

We provide sufficient conditions for a concrete type of systems of delay differential equations (DDEs) to have a global attractor. The principal idea is based on a particular type of global attraction in difference equations in terms of nested, convex and compact sets. We prove that the solutions of the system of DDEs inherit the convergence to the equilibrium from an associated discrete dynamical system.

Citation: Sebastián Buedo-Fernández. Global attraction in a system of delay differential equations via compact and convex sets. Discrete & Continuous Dynamical Systems - B, 2020, 25 (8) : 3171-3181. doi: 10.3934/dcdsb.2020056
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The origin is not a strong attractor
A possible set $Q_{x, v, \varepsilon}$ is represented in gray. Distances are pointed out with dashed green lines. A particular $v^*$ satisfying the hypotheses of the last assertion of Lemma 3.1 is also depicted (color figure online)
Possible behaviour of $x(t, \phi)$ (blue). The boundary of the set $K_2$ is represented in black. The boundaries of $K_{2, \mu}$, for some values $\mu>1$ are represented in grey. The blue arrow represents $x'(t, \phi)$, which "points to the interior" of a $K_{2, \mu}$. $f(K_2)$ is represented in red. The equilibrium $z_*$ is depicted as a point inside $f(K_2)$ (color figure online)
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