@article{onthepolicygradientfoundationsofgrouprel,
  title = {On the Policy Gradient Foundations of Group Relative Policy Optimization: Credit Assignment, Gradient Sparsity, and Rank Collapse},
  author = {Amritansh Mishra and Supriyo Chakraborty and Berkcan Kapusuzoglu},
  year = {2026},
  eprint = {2606.29238},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.29238},
}