Chapter 81 Not Everyone is Lou Song
Although college life is not as stressful as high school life.
But most of the students at Ji University are still quite serious.
In addition to maintaining necessary entertainment activities, I still listen to the lectures seriously and go to the study room to study after class.
What surprised Xu You’s three roommates was that
Xu You never goes to the study room to study.
When I go to the library, I just borrow various books and don’t stay in the library for long.
Even when we occasionally take classes together.
Xu You would not listen to the lectures too attentively. He would often write something on paper while flipping through various books that had little to do with the class content.
And every night, Xu You almost never stays up late.
When the lights are turned off at 11 o'clock in the evening, Xu You goes to bed on time.
In comparison, Xu You does seem a little less diligent.
They all felt that they had a good chance of surpassing Xu You in the final scholarship assessment.
…
That evening, after returning from the study room, Guo Haochen took out his book and continued to study a problem.
This is a question that Guo Haochen spent almost the entire night studying in the study room.
On Guo Haochen's rough paper, he had already written several articles.
Tried many methods, but without any success.
"Wow, this question is so difficult!"
Seeing this, Liu Rui walked over to correct Guo Haochen:
"Come on, read with me: n-an, difficult."
"No, I can't tell the difference between l and l since I was a kid, and I haven't changed in more than ten years."
At this time, Liu Rui looked at the topic that Guo Haochen was researching and couldn't help frowning.
"Are you doing math problems? Why are they different from the math I learned?"
"Ah, a math question. Unless you choose the math major, you don't have to study this subject."
"That's what I said. Why don't you understand it? But didn't you get 150 points in math in the college entrance examination? How could a math problem stump you?"
"How can high school math be the same as college math? High school math is just the tip of the iceberg of math, and 150 points should be easy to get. The really hard part is the math competition. Those who can win the national gold medal in the math competition are the real big shots. And those monsters who can get full marks in the math competition are really amazing!"
"Oh my god, this is so scary. I only scored 145 points in math on the college entrance examination. I dare not say a word."
"Hey, do you know who in Heqing College has chosen the mathematics major? Now, apart from roommates, many people don't even know each other in the same college."
"I don't know. For example, the students in our school don't take classes together, so I don't know many of them well."
"Okay, if it doesn't work, I'll ask the teacher next time."
In fact, Xu You was originally going to take the mathematical analysis course.
It was just because Xu You had already completely learned this course while auditing it before, and this course was not a compulsory course in the first semester of Xu You's major, so Xu You was not in a hurry to choose it.
In addition to the required courses, Xu You tried to choose more courses that he had not studied before.
Otherwise, I really can only read other books during class.
"By the way, Xu You is studying for physics competition and ranked first in IPhO, so he should be good at math too. Xu You, why don't you come over and take a look at this question?"
Liu Rui remembered Xu You's achievements in physical competition and asked Xu You.
Liu Rui didn't have any other thoughts, he just knew that studying physics competition required mastering a lot of university mathematics knowledge.
As for what specific knowledge needs to be mastered, Liu Rui is not very clear.
"Physics competition shouldn't require too much knowledge of mathematics and calculus. Just look at advanced mathematics and learn calculus, and that's probably enough."
Students who are majoring in mathematics like Guo Haochen do not need to take advanced mathematics classes.
Compared with those mathematics courses, advanced mathematics is still too simple.
"Well, let me take a look."
Since Liu Rui called him, Xu You no longer refused.
After all, being able to help roommates solve problems is a good thing.
Guo Haochen was somewhat confused.
As far as he knew, physical competition did not require much knowledge of mathematical analysis.
Although Xu You is very good at physics, it is impossible for him to learn university mathematics courses in advance.
Why come and take a look?
Could it be...
At this time, Xu You picked up Guo Haochen's notebook and started reading it.
"f(x) is continuous on [a, b], and the generalized second-order derivative of f(x) g=lim(h→0+)(f(x+2h)-2f(x)+f(x-2h))/4h^2 is always equal to 0. Prove that f(x)=kx+m (i.e., a linear function)."
After looking at it for a few times, Xu You remembered the question.
When I lived with Lou Song, we worked on this problem together.
Although the process was a bit cumbersome, both of them finished it within ten minutes.
"Construct an error function and you will get the result." Xu You said lightly.
Guo Haochen was stunned when he heard this.
Error function?
There is indeed such a concept.
But aren't you being too broad?
Guo Haochen felt that Xu You must be pretending to know something and just said that casually to make people think he was very powerful.
Although Xu You is indeed very strong in physics, it is a bit too much for him to show off in front of his roommate.
"Could you please write down the process for me?"
Xu You thought that if he gave Guo Haochen a little guidance, he would be able to understand.
When Xu You and Lou Song were discussing topics together before, they could basically understand what the other person meant with just a casual remark or even a glance.
But obviously, Xu You overestimated Guo Haochen's ability to understand.
But after all, geniuses like Lou Song are extremely rare in the whole of China.
Xu You can't ask too much of others.
"Okay, I'll write it down then."
Xu You sat on the chair, picked up the pen, and started writing the process directly.
Guo Haochen didn't expect Xu You to really write, and immediately stared at the draft paper.
Gradually, Guo Haochen's expression changed from suspicion at the beginning, to surprise, and then to realization.
In less than five minutes, Xu You finished writing down the entire problem-solving process.
There is not a single pause; the entire process flows smoothly, with a certain mathematical beauty.
"So this is how the error function is constructed. I understand. Thank you, Xu You."
Guo Haochen is also a very smart child. He quickly understood Xu You’s thinking and determined that this method was correct.
"Fuck, you really figured it out? But it's only been a few minutes. Haochen, how long have you been studying this problem?"
"Hmm... I've been thinking about it for half an hour."
Guo Haochen didn't dare to tell the truth. Including the time he spent in the study room, this question probably troubled Guo Haochen for several hours.
"That's amazing! It took Haochen half an hour to solve the problem, but Xu You solved it in just five minutes. With your level, Xu You can definitely study mathematics."
"Actually, I've done this problem before, but it wasn't so smooth the first time. I'm just average in math, and can't compare to those math geniuses."
Xu You still remembers vividly the fear he once felt when he was dominated by Lou Song.
He was a terrifying genius who couldn't be defeated even by Xu You's cheating.
"That's not right. You didn't take a math class, so how come you've never done this problem?"
