After New Year's Day, Xia 300 was promoted to Xia 400, and Xia Lu's chemistry also scored 100 points, if you count the results of physical education class, it is Xia 500.

After the physics exam, Xia 500 continued to be upgraded to Xia 600.

Except for Biology, which has not yet taken the final exam, Xia Lu has received perfect marks in all other courses, and his GPA is 4.0, with an average score of 100 on a 100-point scale, temporarily ranking first among his peers.

Xia Lu's academic performance was so good, the head teacher Cao Zhenggang summoned Xia Lu alone in the tea room of the three houses of Meiyuan and praised Xia Lu.

"It's not difficult to get a perfect score for a course, but it's hard to get a full score for a course, Xia Lu, continue to keep it. Professor Cao Zhenggang did not hesitate to praise him.

Xia Lu nodded and said, "Well, I will, thank you Teacher Cao for affirming me." ”

"The first semester of your freshman year will be over soon, and in a few months, you will choose your major. Xia Lu, I think you are the most talented in physics, or you should choose to major in physics. "Professor Cao is a theoretical physicist, he is an upright man, and he hopes that Xia Lu can embark on the broad road of physics.

"Well, I'll think about it. Since Xia Lu chose the science experimental class when he entered the school, he will inevitably choose a major direction in physics and chemistry.

At this time, the door of the tea room was pushed open, and a person came in, Professor Yu Feng: "Zhenggang, there is a problem with the accompanying equation you made...... Yo, Xia Lu is also there. ”

Xia Lu greeted warmly: "Teacher Yu is here, Teacher Yu is good." ”

"Xia Lu is good, full marks in mathematics, and full marks in other courses, keep up the good work. Yu Feng praised Xia Lu a few words, and then picked up a water-based pen and wrote the formula on the whiteboard: "According to Zhenggang's algorithm, you will not be able to get the exact solution of the fifth-order nonlinear wave equation, I think it needs to be corrected, otherwise it will be difficult for our project to be completed on time." ”

Cao Zhenggang frowned: "Yu Feng, tell me about your thinking." ”

Yu Feng wiped the mathematical and physical formulas on the whiteboard and continued to write new formulas.

Xia Lu got up and said, "Teacher Cao, Teacher Yu, you are busy, I'll go first." ”

Obviously, Professor Cao and Professor Yu were discussing academic matters, and Xia Lu chose to avoid them.

After Yu Feng finished writing the new formula, he said to Xia Lu in a friendly manner: "It's okay, Xia Lu, you can sit and listen, whether you choose physics or mathematics as a major major, one day you will be exposed to these things." The students of Hongyi Academy will participate in the project from the second year to the third year at the latest, so Xia Lu should be familiar with the process first. ”

"The project I cooperated with Mr. Yu is the intersection of mathematics and physics, Xia Lu, if you are interested, please stay and listen. Cao Zhenggang said a word, and then started a heated academic discussion with Yu Feng.

Xia Lu stayed after all, he was quite interested, what was the topic of cooperation between the two excellent young professors?

The gates of the new world open to the summer road.

The project cooperated by Professors Cao and Yu is a key project of national basic theory research.

Nonlinear partial differential equations can describe many physical phenomena and are widely used in mechanics, control processes, ecological and economic systems, meteorology, chemical cycles, epidemiology and many other fields.

It is very important to find the exact solution of the nonlinear partial differential equation, and the improvement of the theoretical system directly affects the application.

Through decades of unremitting efforts by scholars all over the world, many effective methods have been formed to study the exact solutions of nonlinear partial differential equations.

For example, the well-known backscatter transformation method, CK direct method, rational function expansion method, Buckran transform method, Hirota method, Bannaville truncated expansion method, etc.

However, in some specific application fields, the above methods are difficult to provide the most perfect theoretical support.

Commissioned by relevant departments, Cao Zhenggang and Yu Feng, two scholars who mainly focus on basic theoretical research, decided to jointly invent a new theoretical method to solve practical problems in specific application fields.

"What is this particular field of application?" Xia Lu became more and more interested, and he couldn't help but ask, obviously forgetting that he was just a special auditor.

"Huh. Yu Feng smiled, looking very mysterious.

"Seriously, we don't know, our task is to refine the theory. Cao Zhenggang said.

It is impossible not to know.

They must have known.

But Xia Lu didn't dare to ask more, this kind of thing is an important state secret.

As a first-year student, it is a very special situation for Xia Lu to sit here and listen to two professors discuss the research project of nonlinear partial differential equation theory. That is, the handsome Xia Liubai has this special treatment.

To be honest, Xia Lu didn't fully understand what the two professors were saying, but he didn't understand it at all.

Optimal system, exact solution, fifth-order nonlinear wave equation, conservation law, Maple verification, five million.

Xia Lu learned these keywords.

Professors Cao and Yu wrote and painted a few mathematical physics formulas in this way, and applied for a research grant of 5 million, which is said to be only a preliminary funding.

The CK direct method for nonlinear partial differential equations is a widely used method, and its inventors are Clarkson and Kruskal, two young scholars who were originally unknown.

Later, the paper on the CK direct method was published, and Clarkson and Kruskal became famous in one fell swoop, and Kruskal was hired as an honorary professor by Princeton University, and he invented the Kruzkal algorithm during his time at Princeton, becoming a famous academic bull.

Clarkson and Cruzkal, two famous scholars, have passed away, and Cao Zhenggang and Yu Feng continue to move forward on the basis of the theories of their predecessors.

The Cao-Yu method for nonlinear partial differential equations is still in the demonstration stage, and there is not a single stroke of the eight characters.

At present, the biggest difficulty faced by Cao and Yu is how to obtain a new theoretical method of self-consistent and self-sufficient optimal system + exact solution + fifth-order nonlinear wave equation + conservation law, which has been verified by mathematical software such as Maple.

It is not difficult for Xia Lu to imagine that if the so-called Cao-Yu method is really made and recognized by the international and domestic academic circles, then the two teachers Cao and Yu will definitely become famous, and the young calf will be directly promoted to the rhythm of outstanding bulls.

"Yu Feng, I understand your thoughts, there is no other way, just bite the bullet. The project will be reported to the school in April and the ministry in May, so don't be dashing around this winter vacation, our time is very tight. Cao Zhenggang looked dignified, he undertook the important scientific research tasks assigned by the state, and if there was a time limit, if he could not complete the task on time, it would be very embarrassing.

Yu Feng said: "The manpower is limited, Zhenggang, we can only work hard for the two of us, let's do a phased research result as soon as possible." I'll go first, Xia Lu, you and Teacher Cao continue to chat. ”

After Yu Feng left, Cao Zhenggang said to Xia Lu: "The topic we just talked about, if you listen to it like this, how much can you understand, Xia Lu, your main energy at present should still be on laying the foundation." ”

"Yes, I can only audit, I'm a first-year student, and I'm not qualified to participate in any projects. ”

"That said, if you have enough skills, you are always welcome to join any project team, whether you are an undergraduate or a graduate student, a freshman or sophomore, or a few years old. Xia Lu, do you know who proved Sitapan's conjecture?"

"Who?"

Liu Jiayi, a student from Central South University, proved Sitapan's conjecture when he was just a junior in college, and this Liu student appeared on the news network in 2011, causing a sensation in the academic community. Later, Central South University directly gave Liu millions of funds, half of which was used to continue to overcome academic problems, and the other half was used to improve Liu's life. At the age of 22, Liu became the youngest professor-level researcher in Chinese history, so never underestimate the energy of a young man with a dream. ”

Xia Lu was stunned: "This classmate Liu is too fierce, learn God!"

Cao Zhenggang smiled: "Xia Lu, if you can make achievements similar to those of Liu at the undergraduate level, our Jiangcheng University will definitely give you a funding, half for scientific research and half for life." Of course, you don't have this strength now, so let's lay the foundation with peace of mind. ”