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@misc{direct-companion,
  author = {{OpenAI}},
  title = {{Backward intertwiners and a transitive commutant}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/Backward-intertwiners-and-a-transitive-commutant-September-27-2026/paper.pdf}{OAI:Backward-intertwiners-and-a-transitive-commutant-September-27-2026}},
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}