IRIS: Interleaved Reinforcement with Incremental Staged Curriculum for Cross-Lingual Mathematical Reasoning. - Navya Gupta; Rishitej Reddy Vyalla; Avinash Anand; Chhavi Kirtani; Erik Cambria; Zhengchen Zhang; Zhengkui Wang; Timothy Liu; Aik Beng Ng; Simon See; Rajiv Ratn Shah (ACL (1), 2026)