4. (a) When s > 2 the basin of attraction of -infinity is the intervals
(-infinity, 0) and (1, infinity), together with the (1/s, (s-1)/s), the pair
of intervals (1/s^{2}, (s-1)/s^{2}) and
((s^{2}-1)/s^{2}, (s^{2}-s+1)/s^{2}), and so on.
That is, in addition to (-infinity, 0) and (1,infinity), the basin of attraction
of -infinity is the intervals removed in forming the Cantor set. (See
Figure 4.42.)

(b) log(2)/log(s). See Problem 40 of Chapter 4.

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