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@misc{OAI:A-C1-Counterexample-to-the-Entropy-Conjecture-September-25-2026,
  author = {{OpenAI}},
  title = {{A $C^1$ Counterexample to the Entropy Conjecture}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/A-C1-Counterexample-to-the-Entropy-Conjecture-September-25-2026/article.pdf}{OAI:A-C1-Counterexample-to-the-Entropy-Conjecture-September-25-2026}},
  year = {2026}
}