@article{towardunderstandingunlearningdifficultya,
  title = {Toward Understanding Unlearning Difficulty: A Mechanistic Perspective and Circuit-Guided Difficulty Metric},
  author = {Jiali Cheng and Ziheng Chen and Chirag Agarwal and Hadi Amiri},
  year = {2026},
  eprint = {2601.09624},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2601.09624},
}