@article{sparsityiscombinatorialdepthquantifyingm,
  title = {Sparsity is Combinatorial Depth: Quantifying MoE Expressivity via Tropical Geometry},
  author = {Ye Su and Huayi Tang and Zixuan Gong and Yong Liu},
  year = {2026},
  eprint = {2602.03204},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2602.03204},
}