https://huggingface.co/datasets/ulamai/UnsolvedMath/resolve/main/open-math.pdf
hf download hf://datasets/ulamai/UnsolvedMath/open-math.pdf
curl -L -o open-math.pdf https://huggingface.co/datasets/ulamai/UnsolvedMath/resolve/main/open-math.pdf
