This dataset contains the questions from ArXivLean March 2026 used for the MathArena Leaderboard
problem_idx (int64): Problem index within the corresponding MathArena benchmark.
problem (string): Problem statement, usually stored as LaTeX source.
answer (string): Formal Lean statement… See the full description on the dataset page:
https://huggingface.co/datasets/MathArena/arxivlean-0326.