When this article was originally published in the Bulletin of the Australian Mathematical Society it omitted some details regarding the affiliations for the author Tan Nhat Pham. These have now been updated and corrected.
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Published online by Cambridge University Press: 06 October 2026
When this article was originally published in the Bulletin of the Australian Mathematical Society it omitted some details regarding the affiliations for the author Tan Nhat Pham. These have now been updated and corrected.