1923 In February, Zhou Yulin was born in a staff family. His father Zhou Shiming is a bank clerk, and his mother Wang Meirong is a well-educated housewife. He was deeply influenced by his parents since childhood. My mother manages housework, raises children, bears hardships and stands hard work, is diligent and simple, and often teaches Xiao Yulin to be honest, strict with himself and tolerant of others. His mother's words and deeds are engraved in his heart, which has become his way of life. His father works with abacus and figures in the bank all day and spends his spare time with his family. He always likes to test his children with some interesting arithmetic problems. Once, my father gave me a double-digit question, which made Xiao Yulin, who was only over two years old, answer it. Xiao Yulin broke the fingers of a pair of small hands again and again because he had to recite the number. He always felt that ten fingers were not enough. He cried anxiously, "Who can lend me some fingers?" Caused a burst of laughter. It is in this entertaining atmosphere that Xiao Yulin began to deal with mathematics and became interested in mathematics from an early age.

I was fascinated by arithmetic problems such as chickens and rabbits in the same cage in primary school, and I was fascinated by plane geometry in middle school. The more difficult it is to prove the geometry problem, the more fascinated he is. He often struggles to find all kinds of proofs. Every time he finds a new proof, he gets a kind of happiness in the success of exploration. It is with this persistent energy that, as a middle school student, he actually discovered the sequence theorem in plane geometry, and wrote an article about the simplest situation and published it in Mathematics Bulletin, which revealed his mathematical talent for the first time.

When he graduated from high school, Zhou Yulin made a plan to apply for a major in mathematics. One of his good friends advised him: "It is ok to study mathematics as a hobby, but it is not desirable as a profession." I can only sit on the bench and be a poor teacher in the future. " But Zhou Yulin realized that mathematics is the most basic subject, which is needed by almost every natural science, and has broad development prospects.

194 1 year, Zhou Yulin got his wish and got into the Department of Mathematics of Shanghai Datong University. During his four years in college, he studied hard, not only finishing all the courses in the department of mathematics, but also finishing all the courses in the department of physics, and graduated with excellent results. 1945 graduated from Zhou Yulin University. When War of Resistance against Japanese Aggression won, the Kuomintang authorities were busy grabbing the fruits of the victory of the Anti-Japanese War, and "grabbing" officials staged a farce in Shanghai. The situation is chaotic and employment is difficult. As soon as Zhou Yulin left the university, he faced a grim reality. Later, he was introduced to Nanjing and worked as a teaching assistant in the cram school of the Department of Mathematics and Science of Nanjing Temporary University. 1946 In May and June, the school was dissolved and Zhou Yulin returned to Shanghai.

What should I do in the future? Zhou Yulin lost in thought. He wanted to go to the Institute of Mathematics of the then Academia Sinica for postgraduate study. As a result of the investigation, the Institute of Mathematics did not recruit graduate students, but he was surprised to learn that Professor Chen Shengshen, a famous mathematician, was giving a lecture there. He can attend, even if it is a rare opportunity, he made a decision immediately.

In this way, from the autumn of 1946 to the end of that year, Zhou Yulin had been listening to Professor Chen Shengshen's lecture at the Institute of Mathematics. Chen Shengshen is an internationally renowned mathematician. At that time, Wu Wenjun, Zhang Sucheng, Ye and others who listened to his lectures later became famous mathematicians. Zhou Yulin was so absorbed in every class that he finally caught Chen's attention. On one occasion, Chen Shengshen and Zhou Yulin met in the corridor. He asked Zhou Yulin with concern, "Can you understand my lecture?" Zhou Yulin replied that he understood, and Chen Shengshen asked about his study in the university. Later, Chen Shengshen unexpectedly made an exception and let the auditor stay in the Institute of Mathematics to study topology under his guidance. With his unremitting pursuit and efforts, Zhou Yulin finally embarked on the road of mathematical research, and soon made outstanding achievements and published many academic papers. After liberation, Zhou Yulin was transferred to the Department of Mathematics of Tsinghua University and the Department of Mathematical Mechanics of Peking University. During this period, he has been engaged in topology research, and his published topology papers have been well received by mathematicians such as Hua and Duan Xuefu.

From 65438 to 0954, Zhou Yulin was selected to study in the Soviet Union. He chose the theory of partial differential equations as his major, which was completely unfamiliar to him but badly needed by the country.

After Zhou Yulin arrived in the Soviet Union, he studied in the Department of Mathematical Mechanics of Moscow University. His tutor is Oliynyk, an internationally renowned female mathematician. Oliynyk worked out a detailed study and examination plan with him. I'm very nervous about my study, and I have to study a course in almost two or three months. This is the first time that Oliynyk has accepted students from China. She is a little worried about whether China students can adapt to such intense study. Before the first exam, she asked about Zhou Yulin's preparation a week in advance, and she did well in the exam. In another exam, Zhou Yulin was stumped by a proof question. He thought for a long time, but he didn't find a solution. Then he had a brainwave and thought of his previous job. As a result, he proved it by topological principles. The method of proof is novel and unique, which greatly surprised the examiner. Gradually, Oliynyk and other Soviet teachers were deeply impressed by this diligent and talented China student. This China student is really outstanding. He has written many high-level academic papers and published them in first-class academic journals in the Soviet Union. He made excellent achievements in the study of quasilinear parabolic equations, and thus obtained an associate doctorate in physical mathematics in the Soviet Union, and his dissertation was also rated as an excellent academic paper. The paper on seepage equation published by him and his tutor Oliynyk is considered as a groundbreaking classic. For a long time, a lot of international research in this field has been carried out along the framework of this paper, and it is still cited by mathematicians today after more than 30 years.

Zhou Yulin filled the gap in the theory of partial differential equations for the motherland and won honor for the people of China. From 65438 to 0960, Sino-Soviet relations deteriorated, and the Soviet Union unilaterally tore up the agreement, withdrew experts and suspended aid projects to China. China's fledgling nuclear weapons research must stop. In order to meet the urgent needs of national defense construction, the CPC Central Committee decided to mobilize scientists and engineers from all over the country to form their own nuclear weapons research team. At this time, Zhou Yulin was teaching in Peking University. He was one of the mobilized scientists. The head of the department talked with him, and without saying anything, he reported to his new unit, the Ninth Research Institute of the Ministry of Nuclear Industry, that afternoon.

For the needs of the motherland, Zhou Yulin once again started a new journey in a brand-new field. For the sake of secrecy, Zhou Yulin's name suddenly disappeared from the mathematical world. In the long years since then, like other scientists involved in the development of nuclear weapons, he worked hard for China's nuclear weapons cause in obscurity.

Zhou Yulin was assigned to be in charge of fluid mechanics and numerical simulation. While nervously forming a scientific research team, he seized the time to learn relevant theories from scratch and soon began his research work. He and other scientists organized the key "nine kinds of calculations" to develop nuclear weapons. He proposed a variety of numerical simulation methods with practical value. He put forward a series of requirements and theoretical analysis for the development of electronic computers for nuclear weapons research. The successful development of China's first atomic bomb and hydrogen bomb was the result of a group of scientists and engineers' self-reliance, hard struggle and the concerted efforts of Qi Xin. Zhou Yulin made an outstanding contribution in it. As one of the main participants, he won the first prize of natural science award and the special prize of national scientific and technological progress. 1978, Professor Chen Shengshen, a famous American mathematician and teacher of Zhou Yulin, came to China to give a lecture. In a discussion with domestic mathematicians, he said that due to the delay of the Cultural Revolution and other factors, China's theoretical research on partial differential equations lags far behind the West. He hoped that China's mathematical writing would take strengthening the theoretical study of partial differential equations as a breakthrough, catch up with the advanced level in the world, and make China a great mathematical country in 2 1 century. The teacher's words made Zhou Yulin think a lot. He firmly believes that China people can rank among the world's advanced in the study of partial differential equations, but it needs the efforts of China mathematicians! I am the first international student studying the theory of partial differential equations in New China, and I am duty-bound to contribute to the motherland in this respect! He decided to change his research direction for the third time and restart the research on partial differential equations that had been shelved for nearly 20 years.

At this time, although he has entered the old age, his spirit of fighting for his career has not diminished. Nearly 20 years of practical work experience has laid a solid foundation for his further development. He continued to study the theory of partial differential equations. From 1980 to 1987, more than 50 high-level academic papers have been published. At the DD3 International Double Micro Conference held in Changchun on 1982 and the DD7 International Double Micro Conference held in Tianjin on 1986, Zhou Yulin made a report on the latest academic research, which aroused great interest from mathematicians all over the world. 65438-0987, the research achievement won the third prize of National Natural Science Award.