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Beskrivelse
The equation $x'(t) = - \mu x(t) + f(x(t-1))$, with $\mu \geq 0$ and $xf(x) \le 0$ for $0\neq x\in {\mathbb R}$, is a prototype for delayed negative feedback combined with friction. Its semiflow on $C=C([-1,0],{\mathbb R})$ leaves a set $S$ invariant, whi