Dīng Jù 丁巨
A late-Yuán mathematician active in the southeastern coastal region; fl. c. 1355, conventionally dated from his work’s only preface (Zhìzhèng 15). Birth and death years not securely recorded. CBDB id 100247 confirms the name and dynasty but supplies no further biographical data.
His sole surviving work is the Dīng Jù suànfǎ 丁巨算法 (KR3fc013) in 1 juàn, a brief practical-arithmetic primer (10 problems) preserved through MíngQīng mathematical bibliographies and partially reconstructed in the 1842 Yíjiātáng cóngshū. The work is one of the principal documentary survivals of late-Yuán mid-popular mathematical pedagogy (between the high algebraic tradition of 朱世傑 Zhū Shìjié’s Sìyuán yùjiàn and the early-Míng practical-mathematical compilations of 吳敬 Wú Jìng), and its abacus-anticipating computational shortcuts make it a precursor of the Míng abacus-arithmetic of 程大位 Chéng Dàwèi.