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#### Other small errors and typos (reported by Lei Chen):

- Proof of Theorem 3.12 (i), page 55, line -3 of the proof of (i): $N$ should be $N\chi$.
- Proof of Corollary 3.13, page 57, line 1: $K \vartheta$ should be $K\chi$.
- Claim 2 in Proposition 3.20, page 63:
- $\Omega$ is the set being acted on.
- In line 1 of the proof of this claim, $\gamma$ and $\delta$ are
**both**ย contained in $\Sigma_1$ and both contained in $\Sigma_2$.

- Page 83 line -2: In the display, the last entry on the right-hand side should be $c_k(t_1\varphi_k)$.