When Chen Zhou observed the old man, the old man also observed Chen Zhou with interest.

Eyes met, Chen Zhou politely smiled at the old gentleman, and the old gentleman also smiled kindly.

Just when Chen Zhou was thinking, should these judges come up with questions.

I saw a person next to Mr. Qiu, and whispered a few words to the old man.

The old gentleman smiled at the man and said a few words, and then Chen Zhou saw the man looking at him.

This person looked at Chen Zhou and slowly asked in English, "Briefly talk about how to prove that the 150-order group is not a single group." ”

Is it to start with algebra?

Chen Zhou was slightly surprised.

This question can only be regarded as the basic content of abstract algebra.

The idea is also very simple, just start with Siro's theorem.

But to his surprise, the difficulty of the interview doesn't seem to be high?

After organizing the language a little, Chen Zhou began to state his answers to the questions fluently in English: "First of all, 150=2×3×5^2. According to Sylow's theorem, Sylow 5 groups exist and conjugate each other......"

Chen Zhou narrated, his tone was calm and eloquent.

The overall idea and the details in it are taken care of very comprehensively.

Therefore, with Chen Zhou's narration, many judges nodded slowly.

“...... This contradicts the Lagrangian theorem about the order of subgroups, so it can be proved that groups of order 150 are not monogroups. ”

After Chen Zhou finished answering, he politely greeted the judge who asked the question, and waited for the next question.

The judge nodded with satisfaction, and then communicated with Mr. Qiu next to him in a low voice.

It is often the simplest of these questions that can best test a person's proficiency in knowledge.

And Chen Zhou's answer completely shows his familiarity with knowledge.

After the judge finished communicating with Mr. Qiu, he raised his head and looked at Chen Zhou again, not as cold as before, but said with a smile: "This is my question, I am very satisfied with your answer." In addition, I had a question outside of the competition, and a friend asked me to ask it on my behalf. ”

Although Chen Zhou was puzzled, he said politely: "Please say, if you don't violate the rules of the competition." ”

The man smiled again: "Don't worry, didn't I already communicate just now, don't delay you to win the gold medal." ”

Hearing this, Chen Zhou smiled embarrassedly.

The man stopped talking nonsense and asked directly: "Where have you gone in your research on complex partial differential equations?"

Hearing this, not only Chen Zhou was stunned, but even many judges on the judges' bench were also stunned, what kind of problem is this?

Partial differential equations of complexes?

Isn't this kid an undergraduate? How can he study such an out-of-class problem?

Thinking of the identity of the person who asked the question, these judges couldn't help but guess in their hearts.

But apart from these judges who don't really understand the purpose of this interview.

Other people who knew why they had a special discussion for Chen Zhou's interview alone looked at Chen Zhou with interest, waiting for Chen Zhou's answer.

Including Mr. Qiu himself, he was also waiting for Chen Zhou's answer.

Chen Zhou also reacted at this time.

Aren't complex partial differential equations the ones he mentioned in his research paper on Clifford's analysis?

In addition, what the judge said, he asked on behalf of a friend.

Chen Zhou thought of a lot in an instant.

Regardless of whether this friend is true or not, at least this paper, the judge in front of him has probably read it.

Chen Zhou couldn't help but wonder in his heart, is there anything wrong with the paper?

Aren't they all drafted and waiting to be published?

Chen Zhou finally decided to answer according to the paper.

He then talked about the Cauchy integral formula of the right regular function and the functional properties of the related operators, and some theoretical foundations for solving complex partial differential equations.

Hearing Chen Zhou's answer, the judge nodded: "Okay, I will tell my friend truthfully." I don't have a problem anymore. ”

After speaking, he turned his head and whispered a few words to Mr. Qiu.

Chen Zhou was puzzled again, didn't he say that the interview for each subject was three out of five? This can only be regarded as one question, right?

And it's also a point giveaway......

Different from Chen Zhou's doubts, hearing Chen Zhou's answer and the judge's words, the faces of the other interview judges, whether they knew the truth or didn't know the truth, became strange.

didn't let Chen Zhou wait too long, and Mr. Qiu motioned to the judges of other subjects to ask questions.

For the remaining four subjects: Analysis and Differential Equations, Geometry and Topology, Introduction and Statistics, and Applied and Computational Mathematics, the four judges asked four questions one after another.

The more Chen Zhou answered, the more he felt that something was wrong, why did the four people ask four questions?

Chen Zhou thought that he was not in a relationship with the judges, and they were deliberately releasing water......

After Chen Zhou finished answering everything, Mr. Qiu told Chen Zhou that he could leave.

Although Chen Zhou was a little confused, he still politely said hello and prepared to leave the venue.

At this time, Mr. Qiu stopped Chen Zhou again: "Classmate Chen Zhou, I have an extra question. ”

Chen Zhou turned around and stood up again: "Professor, please speak." ”

Mr. Qiu asked, "What do you think mathematics is?"

Chen Zhou was slightly stunned, and became more and more confused, he asked so many questions before, is this another philosophical question?

What is Mathematics?

In layman's terms, isn't mathematics arithmetic?

Esoteric speaking, mathematics is the description of the existence of quantities and the existence of variations, and the methods and processes of verifying quantities and variations.

But this obviously won't be Mr. Qiu's answer......

Chen Zhou glanced at the inexplicable group of judges, but they were looking at him with curious eyes.

Chen Zhou is very big-headed.

After a little hesitation, Chen Zhou said: "All applied science must start from pure science. All pure science must start with mathematics. Mathematics is the cornerstone of natural science and applied science, as well as the foundation of modern science and technology, and it is also an important indicator to judge a country's comprehensive strength. ”

The judges on the judges' bench, hearing this, turned their eyes to the old man in the middle.

Staring at Chen Zhou, Mr. Qiu smiled and praised: "Well said, mathematics is pure, but it is not pure either. ”

At this time, no one stopped Chen Zhou, and he left the venue smoothly.

Before leaving, Chen Zhou deliberately glanced at the name tags of the people who gave him points in this interview.

After reading it, Chen Zhou only felt even more confused.

Next to Mr. Qiu, the friend asked Professor Zhang Shouwu of Princeton University, and the next four subjects were Professor Wang Fei of the Huaguo Academy of Sciences, Professor Shu Wangqi of Brown University, Professor Yan Anjia of the Huaguo Academy of Sciences, and Professor Liu Jun of Harvard University.

These are all famous mathematicians, especially Professor Zhang Shouwu, who proved the "Pogomolov conjecture" and popularized the Gross-Chakia formula.

After Chen Zhou left, Zhang Shouwu turned his head again and said to the old gentleman beside him, "How is it?"

Mr. Qiu said bluntly: "It is beyond my estimates. ”

Hearing this answer, Zhang Shouwu was slightly surprised.

In their previous internal discussions, Mr. Qiu's comments to Chen Zhou were already very high.

And it is combined with the evaluation given by the independently completed paper.

Unexpectedly, this simple interview actually improved the old man's evaluation.

Mr. Qiu glanced at Zhang Shouwu, but he didn't explain what he meant by exceeding his estimates.

After a pause, Mr. Qiu said, "Tomorrow's dinner, will you present the award with me?"

Zhang Shouwu was stunned for a moment, then nodded with a smile.

The other judges who heard this were shocked at first, and then they thought a lot more.