d. 152 b.c.
Chinese mathematician sometimes credited as author of the Chiu-chang Suan-shu or Jiuzhang Suanshu (Nine chapters of mathematical art). The latter, the oldest known Chinese mathematical text, contained 246 problems, which as the title suggested were presented in nine chapters. Some four centuries after Chang Ts'ang, Liu Hui (fl. c. 263) wrote a famous commentary on the "Nine Chapters."
"Chang Ts'ang." Science and Its Times: Understanding the Social Significance of Scientific Discovery. . Encyclopedia.com. (September 25, 2018). http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/chang-tsang
"Chang Ts'ang." Science and Its Times: Understanding the Social Significance of Scientific Discovery. . Retrieved September 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/chang-tsang