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@misc{OAI:A-nine-dimensional-counterexample-to-Borsuks-covering-assertion-September-23-2026,
  author = {{OpenAI}},
  title = {{A nine-dimensional counterexample to Borsuk's covering assertion}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/A-nine-dimensional-counterexample-to-Borsuks-covering-assertion-September-23-2026/paper.pdf}{OAI:A-nine-dimensional-counterexample-to-Borsuks-covering-assertion-September-23-2026}},
  year = {2026}
}