Rethinking Expert Trajectory Utilization in LLM Post-training for Mathematical Reasoning. - Bowen Ding; Yuhan Chen; Jiayang Lyu; Jiyao Yuan; Qi Zhu 011; Shuangshuang Tian; Dantong Zhu; Futing Wang; Heyuan Deng; Fei Mi; Lifeng Shang; Tao Lin (ACL (1), 2026)