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@misc{OAI:Hyperbolicity-Cones-Without-Semidefinite-Lifts-October-5-2026,
  author = {{OpenAI}},
  title = {{Hyperbolicity Cones Without Semidefinite Lifts}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/Hyperbolicity-Cones-Without-Semidefinite-Lifts-October-5-2026/nonliftable-hyperbolicity.pdf}{OAI:Hyperbolicity-Cones-Without-Semidefinite-Lifts-October-5-2026}},
  year = {2026}
}

@misc{OAI:A-Nonspectrahedral-Hyperbolicity-Cone-September-24-2026,
  author = {{OpenAI}},
  title = {{A nonspectrahedral hyperbolicity cone}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/A-Nonspectrahedral-Hyperbolicity-Cone-September-24-2026/nonspectrahedral-hyperbolicity-cone.pdf}{OAI:A-Nonspectrahedral-Hyperbolicity-Cone-September-24-2026}},
  year = {2026}
}

@misc{OAI:An-Exact-Semidefinite-Lift-of-a-Nonspectrahedral-Hyperbolicity-Cone-October-5-2026,
  author = {{OpenAI}},
  title = {{An Exact Semidefinite Lift of a Nonspectrahedral Hyperbolicity Cone}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/An-Exact-Semidefinite-Lift-of-a-Nonspectrahedral-Hyperbolicity-Cone-October-5-2026/Exact-Semidefinite-Lift-of-a-Nonspectrahedral-Hyperbolicity-Cone.pdf}{OAI:An-Exact-Semidefinite-Lift-of-a-Nonspectrahedral-Hyperbolicity-Cone-October-5-2026}},
  year = {2026}
}