Rectify Evaluation Preference: Improving LLMs' Critique on Math Reasoning via Perplexity-aware Reinforcement Learning. - Changyuan Tian 001; Zhicong Lu; Shuang Qian; Nayu Liu; Peiguang Li; Li Jin 001; Leiyi Hu; Zhizhao Zeng; Sirui Wang; Ke Zeng; Guozhi Cas (AAAI, 2026)