%0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Sanchez, E. %A De la Parra, R.B. %A Auger, Pierre %A Gomez Mourelo, P. %T Time scales in linear delayed differential equations %D 2006 %L fdi:010037626 %G ENG %J Journal of Mathematical Analysis and Applications %@ 0022-247X %K singular perturbations ; aggregation of variables ; delayed differential equations ; two time scales %M CC:0002405660-0053 %N 1 %P 680-699 %R 10.1016/j.jmaa.2005.10.074 %U https://www.documentation.ird.fr/hor/fdi:010037626 %> https://www.documentation.ird.fr/intranet/publi/2006/10/010037626.pdf %V 323 %W Horizon (IRD) %X The aim of this paper is to apply and justify the so-called aggregation of variables method for reduction of a complex system of linear delayed differential equations with two time scales: slow and fast. The difference between these time scales makes a parameter epsilon > 0 to appear in the formulation, being a mathematical problem of singular perturbations. The main result of this work consists of demonstrating that, under some hypotheses, the solution to the perturbed problem converges when epsilon -> 0 to the solution of an aggregated system whose construction is proposed. (c) 2005 Elsevier Inc. All rights reserved. %$ 020