Geodesic
On the instability of linear nonautonomous delay systems
Czechoslovak Mathematical Journal, Tome 53 (2003) no. 3, pp. 497-514.

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The unstable properties of the linear nonautonomous delay system $x^{\prime }(t)=A(t)x(t)+B(t)x(t-r(t))$, with nonconstant delay $r(t)$, are studied. It is assumed that the linear system $y^{\prime }(t)=(A(t)+B(t))y(t)$ is unstable, the instability being characterized by a nonstable manifold defined from a dichotomy to this linear system. The delay $r(t)$ is assumed to be continuous and bounded. Two kinds of results are given, those concerning conditions that do not include the properties of the delay function $r(t)$ and the results depending on the asymptotic properties of the delay function.
Classification : 34D05, 34D09, 34D20, 34K06, 34K20
Keywords: Liapounov instability; $h$-instability; instability of delay equations; nonconstant delays 
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     author = {Naulin, Ra\'ul},
     title = {On the instability of linear nonautonomous delay systems},
     journal = {Czechoslovak Mathematical Journal},
     pages = {497--514},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {2003},
     mrnumber = {2000048},
     zbl = {1080.34543},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2003__53_3_a0/}
}
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Naulin, Raúl. On the instability of linear nonautonomous delay systems. Czechoslovak Mathematical Journal, Tome 53 (2003) no. 3, pp. 497-514. http://geodesic.mathdoc.fr/item/CMJ_2003__53_3_a0/