In a comment on Timothy Chow's recent answer that cited a paper a by O. Costin, H. Friedman and myself concerned with integration on the surreals, I noted that the cited paper has now been superseded by a revised and expanded version of portions that paper, and that Costin and I expect to post the revised version on arXiv within the next few weeks. I'm pleased to note that the revision (Integration on the Surreals: https://arxiv.org/abs/2208.14331) has now appeared. A separate paper by Costin and Friedman concerned with a different portion of the original paper will appear on another occasion.
Philip Ehrlich
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