China

Jia Xian (Simplified Chinese: 贾宪, Traditional Chinese: 賈憲, Pinyin Alphabet: Jiǎ Xiàn, Wade-Giles /Beijing Chinese: Chia Hsien; 1010-1070) was a Chinese mathematician and astronomer. Besides the fact that he succeeded in defining Pascal's triangle in the eleventh century, he made many mathematical inventions and astronomical discoveries.