Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Wu Wenjun is a Chinese mathematician and academician at the Chinese Academy of Sciences (CAS). Wu''s ancestral hometown is Jiashan, in Jiaxing of Zhejiang. Wu was born in Shanghai, China where he would later graduate from Chiao Tung University (currently Xi''an Jiaotong University and Shanghai Jiao Tong University) in 1940. In 1945, Wu taught several months at Hangchow University in Hangzhou. In 1947, he went to France for further study at the University of Strasbourg. In 1949, he received his PhD, for his thesis Sur les classes caractéristiques des structures fibrées sphériques, written under the direction of Charles Ehresmann. Afterwards, he did some work in Paris with René Thom and discovered the Wu class and Wu formula in algebraic topology. In 1951 he was appointed a post at Peking University.