@article{verifiablecounterfactualsupervisionforpr,
  title = {Verifiable Counterfactual Supervision for Process Reward Models},
  author = {Yinghui Chi and Yuanhong Wang},
  year = {2026},
  eprint = {2605.02395},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.02395},
}