Ten Mathematical Classics (Chinese) (Beijing, 1963). Y Ruan, Biographies of Mathematicians and Astronomers (Chinese) 1 (Shanghai, 1955). K Shen, J N Crossley and A W-C Lun, The nine chapters on the mathematical art : Companion and commentary (Beijing, 1999). External links 7th-century Chinese mathematicians Medieval Chinese mathematicians Sui dynasty politicians Sui dynasty writers Tang dynasty politicians Tang dynasty science writers