Original: He is only known for authoring Sun Tzu Suan Ching å å ç -- ç '' ( pinyin : Sun Zi Suan Jing ; literally , '' Sun Tzu 's Calculation Classic '' ) , which contains the Chinese remainder theorem .
Simplified: 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 .