@article{reinforcementlearningfinetunesasparsesub,
  title = {Reinforcement Learning Fine-Tunes a Sparse Subnetwork in Large Language Models},
  author = {Andrii Balashov},
  year = {2025},
  eprint = {2507.17107},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2507.17107},
}