DeepMath-103K: A Large-Scale, Challenging, Decontaminated, and Verifiable Mathematical Dataset for Advancing Reasoning - He, Zhiwei; Liang, Tian; Xu, Jiahao; Liu, Qiuzhi; Chen, Xingyu; Wang, Yue; Song, Linfeng; Yu, Dian; Liang, Zhenwen; Wang, Wenxuan; Zhang, Zhuosheng; Wang, Rui; et al. (International Conference on Learning Representations, 2026)