Wu Xinmou, 19 10 April 14 was born in Lujiaqiao Town, Jiangyin County, Jiangsu Province. Grandfather Wu was born with. My father, Master Wu, is a history teacher at Liyan Middle School in Jiangyin County (now a junior middle school in Jiangyin County). He has taught Ze Guang Bei for more than ten years and enjoys high prestige among teachers and students. Later, he was dismissed by the ruthless headmaster because of tuberculosis, and died unfortunately in 1923. Three months later, Wu Xinmou's mother Liu Wenxiu also died of lung disease, leaving Wu Xinmou, who was only 13 years old, helpless and adopted by her uncle. Wu Xinmou has been diligent and studious since childhood. 14 years old, admitted to the Third Normal University of Jiangsu Province (now Wuxi Normal University). The head teacher was Qian Mu, who became famous later. Wu Xinmou's father was a history teacher before his death, but he was also interested in mathematics. He often keeps a Japanese arithmetic book. Probably because of his father's early influence, Wu Xinmou also took a keen interest in mathematics and was among the best in mathematics at school. 1928 was admitted to the Department of Mathematics of Central University and studied under Mr. He Lu. He Lu studied in France in his early years and devoted himself to mathematics education after returning home. His math course left an unforgettable impression on Wu Xinmou. /kloc-in the winter of 0/932, Wu Xinmou returned to his hometown after graduating from university and taught mathematics in Jiangyin Middle School where his father used to work. From 65438 to 0934, He Lu was introduced to Tsinghua University as a teaching assistant and studied the theory of differential equations under the guidance of Mr. Xiong Qinglai. 1937 was admitted by the China-France Education Fund Committee as the first publicly-funded international student and went to France in August of the same year. Qian Sanqiang (Wu Xinmou established and maintained a long-term friendship with Qian Sanqiang) and Gao (later a professor of philosophy at Peking University) traveled in Europe. After arriving in Paris, I met with Zhuang Qitai, who had arrived in France in advance, lived in the Greek Pavilion in Paris University Town, and soon met J. Hadamard. At that time, Adama was an internationally renowned master of mathematics and made great contributions to functional analysis, analytic number theory, function theory and differential equation theory. 1936 adama visited China and taught partial differential equations in Tsinghua University. Wu Xinmou not only listened to his lecture, but also took notes. Under Adama's introduction, Wu Xinmou studied viscous fluid mechanics from Professor H. Villat of Paris University, and began to study partial differential equations with Adama himself from 65438 to 0939. At that time, the European War broke out. /kloc-in the summer of 0/940, Hitler's army invaded France and Paris fell. Wu Xinmou and some other China students went into exile in the southern city of Toulouse, where Adama also took refuge. Adama encouraged Wu Xinmou to continue to study partial differential equations, and especially suggested that he pay attention to the latest achievements of hyperhyperbolic equations. According to the direction given by the teacher, Wu Xinmou's research work is progressing smoothly. Almost at the same time, Wu Xinmou proposed to expand and modify Adama's lecture in Tsinghua University and compile it into a book. Adama readily agreed. He put Wu Xinmou in charge of the actual handling and gave a lot of guidance.

During his life in France, Wu Xinmou took an active part in the anti-Japanese patriotic movement led by the China Production Party. As early as 1939, he was the editor of the progressive publication "Anti-Japanese Information of the Motherland" sponsored by the Travel Law Branch of China * * * Production Party. During the war years, the students studying in China were in a difficult situation and had a hard material life. Many people often eat in humble canteens, or exchange a small amount of cigarettes and wine for some bread. In spite of this, Wu Xinmou still tried to support the revolutionary activities of the Travel Law Branch of China's * * * production party. 1945, Wu Xinmou officially joined the China * * * Production Party, and served as a member of the China * * * Travel Branch and secretary-general of the French Overseas Chinese Federation. He successively carried out the Party's work under the leadership of Deng Fa and Liu Ningyi, and earnestly completed the tasks entrusted by the Party organization.

1In August, 945, with the overall victory of the anti-fascist war, Wu Xinmou returned to Paris. 1947 was recommended by adama as an affiliated researcher of French scientific research center. 1949, Wu Xinmou welcomed the establishment of People's Republic of China (PRC). 195 1 year, he resolutely returned to his long-lost motherland with his family and devoted himself enthusiastically to the cause of mathematics in People's Republic of China (PRC). After returning to China, Wu Xinmou worked as a researcher at the Institute of Mathematics of China Academy of Sciences. 1953 took the lead in establishing the differential equation group of Institute of Mathematics. 1956, the group expanded to the differential equation laboratory including ordinary differential equations and partial differential equations. For a quarter of a century, Wu Xinmou has been the director of this laboratory, and once served as a member of the party group of the Institute of Mathematics of China Academy of Sciences.

Wu Xinmou engaged in fluid mechanics research in his early years, focusing on the stability of viscous fluid motion. 1938 published a paper surunthéorèmederlorrayleigh in French Academy of Sciences (on Rayleigh Theorem), which extended the famous Rayleigh Theorem related to the complete fluid periodic motion equation under the condition that only the second derivative of the initial velocity distribution function is continuous. This result is of great significance to overcome the difficulties faced by small motion methods commonly used in classical fluid motion stability theory.

Since the 1940s, the theory of partial differential equations has become the main field of Wu Xinmou's long-term exploration. Firstly, he studied the ill-posed Cauchy problem (analytic continuation of several real variable functions) in the time plane of wave equation. Adama once obtained a set of (3) necessary conditions for Cauchy problem to have a solution in the time plane of wave equation. Wu Xinmou proved by H.A. Schwarz theorem that one of the conditions depends on the other two. This result was quoted by Adama in the collection commemorating R. Courand's 60th birthday in 1948, and it was pointed out that the analytic extension of multiple real variables is a new problem, and the shape of the extension region is no longer arbitrary.

In 1950s, Wu Xinmou's interest focused on the theory of mixed partial differential equations. The first "zero integral" method (which later evolved into abcPQR method in general literature) has been valued and cited by famous scholars such as K.O. Friedrichs, and this article has been designated as a reading document by Courand Institute in the United States.