@article{polynomialtimeoptimalgroupselectionviath,
  title = {Polynomial-Time Optimal Group Selection via the Double-Commutator Eigenvalue Problem},
  author = {Mitchell A. Thornton},
  year = {2026},
  eprint = {2605.00834},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.00834},
}