“…[16], [3], [15], [2], [4], [5], [1], [21], [30]). For the recent development of sensitivity in topological dynamics see for example the survey [31] by Li and Ye. According to the works by Guckenheimer [17], Auslander and Yorke [7] a dynamical system (X, T ) is sensitive if there exists δ > 0 such that for every x ∈ X and every neighborhood U x of x, there exist y ∈ U x and n ∈ N with d(T n x, T n y) > δ. Such a δ is also called a sensitive constant of the system (X, T ).…”