This article is about the mathematician Sun Tzu. For the military strategist of the same name, see Sun Tzu.

Sun Tzu or Sun Zi was a Chinese mathematician of the third century CE.

His interests were in astronomy. He tried to develop a calendar and for this he investigated Diophantine equations. He is best known for authoring Sun Tzu Suan Ching (pinyin: Sun Zi Suan Jing; literally, "Sun Tzu's Calculation Classic"), which contains the Chinese remainder theorem.

• Sun Tzu at MacTutor Archived 2006-09-13 at the Wayback Machine

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