Ke Zhao or Chao Ko (, April 12, 1910 – November 8, 2002) was a Chinese mathematician born in Wenling, Taizhou, Zhejiang. Biography Ke graduated from Tsinghua University in 1933 and obtained his doctorate from the University of Manchester under Louis Mordell in 1937. His main fields of study were algebra, number theory and combinatorics. Some of his major contributions included his work on quadratic forms, the Erdős–Ko–Rado theorem and his theorem on Catalan's conjecture. In 1955, he was one of the founding members of the Chinese Academy of Sciences. He was later a professor at Sichuan University and became the president of the university and of the Chinese Mathematical Society. References 1910 births 2002 deaths Alumni of the Victoria University of Manchester 20th-century Chinese mathematicians Educators from Taizhou, Zhejiang Mathematicians from Zhejiang Members of the Chinese Academy of Sciences People of the Republic of China Scientists from Taizhou, Zhejiang Xiamen University alumni Tsinghua University alumni Academic staff of Tsinghua University Presidents of Sichuan University