WIAS Preprint No. 820, (2003)

Delayed loss of stability in systems with degenerate linear parts


  • Rachinskii, Dimitri
  • Schneider, Klaus R.

2010 Mathematics Subject Classification

  • 34D15 37G15


  • singular perturbation, delayed loss of stability, periodic solution, Hopf bifurcation




We study singularly perturbed scalar and planar differential equations with linear parts independent of time. The associated autonomous equations undergo a bifurcation of equilibria in scalar case and the Hopf bifurcation in case of planar systems at a bifurcation point where the zero equilibrium loses stability. We suggest natural sufficient conditions for the phenomenon of delayed loss of stability for the singularly perturbed equations and estimate the asymptotic delay. Bifurcation points, stability of the zero equilibrium, and the asymptotic delay are determined by superlinear terms in the expansions of the right-hand sides of the associated and singularly perturbed equations.

Appeared in

  • Z. Anal. Anwend., 22 (2003), pp. 433-453

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