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MATHEMATICA BOHEMICA, Vol. 122, No. 1, pp. 37-55 (1997)
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The behaviour of the nonwandering set of a piecewise monotonic interval map under small perturbations

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Peter Raith

* Peter Raith*, Institut für Mathematik, Universität Wien, Strudlhofgasse 4, A-1090 Wien, Austria, e-mail: ` peter@banach.mat.univie.ac.at`

**Abstract:** In this paper piecewise monotonic maps $T [0,1]\to[0,1]$ are considered. Let $Q$ be a finite union of open intervals, and consider the set $R(Q)$ of all points whose orbits omit $Q$. The influence of small perturbations of the endpoints of the intervals in $Q$ on the dynamical system $(R(Q),T)$ is investigated. The decomposition of the nonwandering set into maximal topologically transitive subsets behaves very unstably. Nonetheless, it is shown that a maximal topologically transitive subset cannot be completely destroyed by arbitrary small perturbations of $Q$. Furthermore it is shown that every sufficiently "big" maximal topologically transitive subset of a sufficiently small perturbation of $(R(Q),T)$ is "dominated" by a topologically transitive subset of $(R(Q),T)$.

**Keywords:** piecewise monotonic map, nonwandering set, topologically transitive subset

**Classification (MSC2000):** 58F03, 54H20, 58F15

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