# American Institute of Mathematical Sciences

April  2001, 7(2): 259-274. doi: 10.3934/dcds.2001.7.259

## Contracting return maps for monotone delayed feedback

 1 Mathematisches Institut, Universität Gieβen, Arndtstr. 2, 35392 Gieβen, Germany

Revised  September 2000 Published  January 2001

For equations

$\dot{x}(t)=-\mu x(t)+f(x(t-1))$

with continuous odd nonlinearities close to a step function $f_a(\xi)=-a$sign$\xi$, $a>0,$ we find sets of initial data to which solutions return. For Lipschitz nonlinearities the associated return maps become Lipschitz continuous. Monotonicity of $f$ close to 0 permits sharp estimates of the Lipschitz constants of the return map. If outside a neighbourhood of 0 the Lipschitz constant of $f$ is sufficiently small then the return map becomes a contraction, whose fixed point defines an attracting periodic orbit of the differential equation. Applications include the cases $f(x)=g(\gamma x)$ with $g'(x)=-(1+x^r)^{-1}$ for $x>0$, $r>\frac{3}{2}$ and $\gamma>0$ sufficiently large.

Citation: Hans-Otto Walther. Contracting return maps for monotone delayed feedback. Discrete & Continuous Dynamical Systems - A, 2001, 7 (2) : 259-274. doi: 10.3934/dcds.2001.7.259
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