Do MLLMs Really Understand Space? A Mathematical Reasoning Evaluation. - Shuo Lu; Jianjie Cheng; Yinuo Xu; Yongcan Yu; Lijun Sheng; Peijie Wang; Siru Jiang; Yongguan Hu; Run Ling; Yihua Shao; Ao Ma 005; Wei Feng; et al. (CoRR, 2026)