Top Student

Although college life is not as stressful as high school.

But most of Ji University's students are more serious.

In addition to retaining the necessary entertainment activities, I will still listen to the class carefully and go to the self-study room for self-study after class.

What surprised Xu You's three roommates was.

Xu You never went to the self-study room for self-study.

When I go to the library, I just borrow all kinds of books and don't stop in the library.

Even the occasional class together.

Xu You also doesn't pay too much attention to the class, and often writes something on the paper while flipping through various idle books that have little to do with the class content.

And every night, Xu You hardly stayed up late.

When the lights are turned off at 11 pm, Xu You will go to bed on time.

In contrast, Xu You did not seem to be diligent enough.

They all felt that they had every hope of surpassing Xu You in the evaluation of the final scholarship.

...

That night, after returning from the self-study room, Guo Haochen took out his books and continued to study a topic.

This is a topic that Guo Haochen studied for almost a whole night in the self-study room today.

On Guo Haochen's straw paper, he has already written several articles.

Tried various methods, all without success.

"Wow, this question is so (difficult)!"

Seeing this, Liu Rui walked over and corrected Guo Haochen:

"Come on, read with me: n-an, difficult."

"No, I have not distinguished l-l since I was a child, and I haven't changed it for more than ten years."

At this time, Liu Rui looked at the topic Guo Haochen was studying, and couldn't help frowning.

"Are you doing math problems? Why is it different from the math I learn?"

"Ah, a counting question. Except for the direction of mathematics, you don't have to study this subject."

"What I said, I don't understand why. But you didn't score 150 in mathematics in the college entrance examination, and you still have math problems that stump you?"

"Can high school mathematics be the same as college mathematics? High school mathematics can only be said to be a bit of a superficial study of mathematics. It should be easy to get a score of 150. The real difficulty is the mathematics competition. It is true that the mathematics competition can win the national fund." Boss. There are also monsters that can get full marks in the math competition, that is really amazing!"

"Oh my God, it's terrible. Let me, who only got 145 points in mathematics in the college entrance examination, dare not speak at all."

"Hey, do you know who in our Heqing College has chosen a mathematics direction? Now, apart from roommates, many of them don't know each other."

"I don't know, like those in our school, they don't attend classes together, and many of them are unfamiliar."

"Okay, no, I'll ask the teacher next time."

In fact, Xu You originally wanted to take the course of mathematical analysis.

It was just because Xu You had already thoroughly learned this course when he was auditing, and this course was not a compulsory course for Xu You's major in the first semester of freshman year, so Xu You was not in a hurry to choose it .

In addition to the required courses, Xu You still chooses as many courses as possible that he has not studied.

Otherwise, I really can only read other books in class.

"By the way, Xu You is a student of Wujing, the first place in IPhO, and his mathematics should not be bad. Xu You, why don't you come over and take a look at this question?"

Liu Rui thought of Xu You's achievements in physical competition, so he asked Xu You.

Liu Rui didn't have any other thoughts. He only knew that learning physics requires a lot of college mathematics knowledge.

As for the specific knowledge that needs to be mastered, Liu Rui is not very clear.

"Wujing probably doesn't need much knowledge of mathematics. If you look at advanced mathematics, learning calculus is almost enough."

A student of mathematics like Guo Haochen does not need to take advanced mathematics courses.

Compared with those courses for mathematics majors, advanced mathematics is still too simple.

"Well, let me take a look."

Now that Liu Rui called him, Xu You no longer shirked.

After all, being able to help roommates solve problems is also a good thing to do.

Guo Haochen was somewhat puzzled.

As far as he knows, it is true that there is not much knowledge of mathematical analysis in the matter competition.

Although Xu You is very good at physics, it is impossible for him to take the courses of mathematics major in college in advance.

Why come over and take a look?

Could it be...

At this time, Xu You picked up Guo Haochen's notebook and read it.

"f(x) is continuous on [a, b], the generalized second derivative of f(x) g=lim(h→0+)(f(x+2h)-2f(x)+f(x-2h ))/4h^2 is always equal to 0, and prove that f(x)=kx+m (that is, a linear function).”

After a few glances, Xu You remembered this question.

When I was living with Lou Song, the two of them had done this problem together.

Although the process was a bit cumbersome, within ten minutes, both of them had done it.

"Construct an error function, and it will come out." Xu You said lightly.

Guo Haochen was taken aback when he heard this.

error function?

There is indeed such a concept.

But what you said is too broad, right?

Guo Haochen felt that Xu You must be pretending to understand, and casually said that, making people think that he is very powerful.

Although Xu You is indeed very strong physically, it is a bit too much to pretend to be X in front of his roommate.

"Then can you please help me write the process?"

Xu You thought that Guo Haochen would be able to understand with a little bit of poking around.

When Xu You and Lou Song discussed topics together before, they basically just said a word, or even a look, and the other party could understand what they meant.

But obviously, Xu You overestimated Guo Haochen's understanding ability.

But after all, geniuses like Lou Song are very few in China.

Xu You can't demand too much from others.

"Okay, then I'll write it down."

Xu You sat on the chair, picked up the pen, and started writing directly.

Guo Haochen didn't expect Xu You to really write, so he stared at the draft paper closely.

Gradually, Guo Haochen's expression changed from suspicion at the beginning, to astonishment, and then to bewilderment.

In less than five minutes, Xu You wrote the entire problem-solving process.

There was no pause, the whole process was smooth and flowing, and it also had a certain aesthetic feeling unique to mathematics.

"It turns out that the error function is constructed like this. I understand, thank you, Xu You."

Guo Haochen is also a very smart child, he quickly understood Xu You's thinking, and confirmed that this method is correct.

"Fuck, did you really make it? But it's only been a few minutes, Haochen, how long have you been studying this problem?"

"Well...I thought about it for half an hour."

Guo Haochen didn't dare to tell the truth, counting the time in the self-study room, this question probably troubled Guo Haochen for several hours.

"Awesome, Xu You solved the problem that Haochen hadn't solved in half an hour in five minutes. With Xu You's level, you can definitely learn mathematics."

"Actually, I've done this question before, and the first time I did it, it didn't go so smoothly. My math talent is average, and I can't compare with those math geniuses."

Xu You still remembers the fear of being dominated by Lou Song once.

That was a terrifying genius who couldn't even defeat Xu You.

"That's not right, you didn't take the class with scores, how did you do this question?"