WIAS Preprint No. 2067, (2015)

Classification of coupled dynamical systems with multiple delays: Finding the minimal number of delays


  • Lücken, Leonhard
  • Pade, Jan Philipp
  • Knauer, Kolja

2010 Mathematics Subject Classification

  • 34K17 34K20 37L15, 37L05


  • multiple delays, networks with delay, coupled dynamical systems, delay differential equations, dynamical equivalence, semidynamical systems, cycle space




In this article we study networks of coupled dynamical systems with time-delayed connections. If two such networks hold different delays on the connections it is in general possible that they exhibit different dynamical behavior as well. We prove that for particular sets of delays this is not the case. To this aim we introduce a componentwise timeshift transformation (CTT) which allows to classify systems which possess equivalent dynamics, though possibly different sets of connection delays. In particular, we show for a large class of semiflows (including the case of delay differential equations) that the stability of attractors is invariant under this transformation. Moreover we show that each equivalence class which is mediated by the CTT possesses a representative system in which the number of different delays is not larger than the cycle space dimension of the underlying graph. We conclude that the 'true' dimension of the corresponding parameter space of delays is in general smaller than it appears at first glance.

Appeared in

  • SIAM J. Appl. Dyn. Syst., 14 (2015) pp. 286--304.

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