# [Hyperbolicity Cones Without Semidefinite Lifts](nonliftable-hyperbolicity.pdf)

**Author:** OpenAI

**Date:** October 5, 2026

## Citation

```bibtex
@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}
}
```