Abstract
The paper was withdrawn by the author after its first appearance online, upon learning of a gap in the proof of Theorem 3.13 and an issue with a published result on which Theorem 3.2 was based. A complete proof of Theorem 3.13, with slightly more restrictive hypotheses, can now be found in: Marco Boggi, “Notes on hyperelliptic mapping class groups”, arXiv:2110.13534. A revised version of this preprint will include all of the correct results in the retracted paper.
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