Remembering Professor Wu Wen Tsun, Jean-Pierre BOURGUIGNON 

　　I had the privilege to meet Professor Wu Wen Tsun a number of times, in France on the occasion of one his trips to my country in the 1980s, and then regularly in China. The last time wason the occasion of the celebration of the late Professor Chern Shiing Shen’s centenary in 2011 at the Chern Institute in Nankai. I remember vividly his smile and his kindness to me as well as his interest in getting news from what was happening in mathematics. He also liked to recall memories of his time in Strasbourg with Professor Charles Ehresmann and Professor Henri Cartan, as well as his exchanges with René Thom. His important contributions to algebraic topology at a turning point for the theory are kept alive through the Wu classes and the Wu operations. They are a lasting testimony of his creativity. Later on, at a time where very few dared to do that, he embarked into an exploration of the interface between computer science and mathematics along the path of automatizing proofs. He was a faithful actor of the collaboration between China and France in the field of mathematics, and we are very grateful for his persistant action. His memory is to be very carefully kept.

　　

　　Jean-Pierre BOURGUIGNON

　　Honorary Professor at the Institut des Hautes Études Scientifiques

　　Directeur de recherche émérite au Centre National de la Recherche Scientifique.