linear algebra

Liu Hui (Chinese: 劉徽; pinyin: Liú Huī; 225-295 AD) was a Chinese mathematician who lived during the Wei Dynasty. His contributions, especially the narrative he wrote called "Nine Chapters on the Art of Mathematics" include a proof of the Pythagorean Theorem, theorems of solid geometry, an improvement on Archimedes' π approach, and a systematic method for deciphering linear equations in several unknowns.