Chapter 69 Editorial Board’s Response
Theoretical mechanics is a professional course in engineering mechanics. In addition, it also includes many other professional courses such as material mechanics, engineering thermodynamics, fluid mechanics, etc. The electives involve different fields and are very complex.

In addition, you also need to learn university physics, as well as calculus, linear algebra, partial differential equations, etc.

The course schedule is much more than that of the Department of Mathematics. Logically speaking, Xu Yuan should devote more energy to engineering mechanics.

But the fact is that Xu Yuan has much more knowledge about engineering mechanics than mathematics.

As the class progressed, Xu Chongxing seemed to have forgotten that Xu Yuan had not attended the previous classes, and his attention was focused on what he was saying.

"Last time we discussed the system of intersecting forces using an analytical approach, a basic calculation."

"A projection standing on an axis."

"It's very simple. Mathematics has already explained this concept."

"I've talked about this vector projection operation in statics, kinematics and dynamics before."

……

Xu Yuan listened to these familiar contents and gradually felt that he might have been overthinking today.

Professor Xu Chongxing probably had no intention of making things difficult for him.

Soon the class ended, and Xu Chongxing picked up a piece of chalk and drew a shape on the blackboard. Then he turned around and his sharp eyes were immediately fixed on Xu Yuan in the audience.

Meeting Xu Chongxing's gaze, Xu Yuan just realized that before he could react, he heard the other party's voice sounded in his ear.

"Student Xu Yuan."

"Come up and draw the force diagram of this component for everyone."

When the other people around heard this, they looked at Xu Yuan with a little more sympathy in their eyes.

After all, everyone can tell that Professor Xu did it on purpose.

Everyone knows that Xu Yuan has never attended class. Now he is called up to do exercises in theoretical mechanics. It will be embarrassing if he cannot finish them.

It would be fine if he was just an ordinary freshman, but Xu Yuan has too many halos on his head.

Xu Yuan was not surprised at Xu Chongxing's actions at all. On the contrary, he even felt a sense of familiarity that he had not felt for a long time.

Hearing this, he had no hesitation in getting up and walking towards the platform. He could hear some murmurs from other people as he passed by.

"Do you think he can do it?"

"After all, I've won a gold medal in the Mathematical Olympiad, so it should be OK even if I haven't taken any mechanics classes."

"The picture Professor Xu drew is not complicated. I guess he just knocked it over a little bit and didn't intend to embarrass Xu Zhuangyuan."

"Anyway, this picture gives me a headache."

"It would be tragic if we really can't do it. Someone will definitely post it on the school forum."

……

Xu Yuan listened to everyone's discussions and a playful smile appeared in his heart.

Not to mention that Xu Chongxing only gave a theoretical mechanics question, even if it was a question about fluid mechanics, he could still solve it easily on the spot.

What's more, compared to his previous life, he now has the bonus of mathematical knowledge, which will only make the solution process easier.

You know, he hasn't used the progress bar panel to judge whether his idea is correct.

"Professor Xu."

Xu Yuan walked to the stage and first called out to Xu Chongxing, then took the chalk and faced the blackboard.

"The self-weight of components without gravity is ignored, and all contacts are smooth contacts."

Xu Chongxing looked at Xu Yuan closely and offered his conditions again.

Hearing this, Xu Yuan nodded, glanced at the graph on the blackboard, and began to answer without any hesitation.

First, take the object of study, draw the main driving force and the restraining force, and it will be done in less than half a minute before you put down the chalk.

"Professor Xu, I've finished the painting."

Xu Chongxing's eyes were originally on the stage, but when he turned his head he found that Xu Yuan had finished the painting.

There was some surprise in his eyes.

"So fast?"

He naturally believed that Xu Yuan could solve this exercise, but he didn't expect that he didn't even have time to think.

It would be impossible to reach this level if it weren't for a lot of practice and solid knowledge.

The thought stopped here and he immediately asked, "Have you ever taught yourself engineering mechanics?"

Xu Yuan answered, "I spent my holidays studying in the library."

As the saying goes, everyone loves talented people. At this time, Xu Chongxing also discovered that Xu Yuan's talent in engineering mechanics seemed to be not much lower than that in mathematics.

Maybe it could be even higher than mathematics.

In this case, he could not continue to let Xu Yuan focus on mathematics, as engineering also had a bright future.

As these thoughts flashed through his mind quickly, Xu Chongxing immediately made up his mind and his expression relaxed, even showing a hint of anticipation and joy than before.

He first coughed twice to attract Xu Yuan's attention, and then explained in a kind manner.

"You have reached this level through self-study, which shows that you are quite talented in engineering mechanics, so you must not waste your talent."

"Please pay attention to the lectures on engineering mechanics in the future. If you have any questions, you can come to me for help."

When Xu Chongxing's words were heard in the classroom, the freshmen of the Department of Mechanics who were waiting to watch the fun looked at each other in shock.

I never expected that Xu Yuan could change Professor Xu's attitude in less than half a minute.

It turns out that the clown is actually me.

They were just worried about Xu Yuan being embarrassed. "So this is what a true academic god is like. Even if he doesn't come to class, he can still kill everyone in seconds."

"Compared to Xu Yuan, those top students in my high school class are nothing!"

When they were in high school, they studied hard and stayed up late into the night, and were called academic masters because of their high scores. It was not until they met Xu Yuan that they suddenly realized how big the gap between them was.

But just as they were reflecting on themselves in the audience, they heard Xu Yuan make shocking remarks.

"I'm sorry, Professor Xu."

“As for professional courses, I still want to arrange them myself.”

"The routine class is not for me."

Xu Yuan didn't mean to go against Xu Chongxing on purpose. The main reason was that if he really came to the Engineering Department to attend classes every day, it would be a complete waste of his time.

Can't learn anything new at all.

However, Xu Chongxing didn't know Xu Yuan's level after all, so he took a deep breath and controlled his emotions.

Finally, a more compromising solution was given.

"Since you are so confident in yourself, I will promise you that as long as you get full marks in the engineering mechanics course in the midterm exam."

"But I will write your test paper myself."

Xu Chongxing had a good idea. He made the test paper for Xu Yuan himself and didn't believe that Xu Yuan could get full marks.

At that time, we can use this as an excuse to persuade the other party to focus on engineering mechanics.

Xu Yuan could only say that he was least afraid of exams. He was confident even if Xu Chongxing set the questions himself.

So without any hesitation, he immediately replied, "I will prepare well for the exam, Professor Xu."

In the following time, Xu Yuan stepped down from the stage and returned to his seat. He kept a calm expression on his face and did not take the incident that had just happened to heart.

Although the other students in the classroom were shocked by Xu Yuan's performance in the test just now, they were not optimistic that Xu Yuan would be able to get full marks in the professional course in the midterm exam next month.

If it was a normal department exam, there might still be hope, but since the questions were set by a great professor himself...

Just thinking about the difficulty makes my scalp tingle.

Soon it was twelve o'clock and the morning's theoretical mechanics class officially ended.

After class, Xu Yuan was stopped by his classmates and asked to leave a few contact information. Then he went downstairs and went straight to Tang Shihong's office.

The reason why he didn't go to the cafeteria to find Li Zhenya and others was because he received a text message from Tang Shihong during class.

Although the other party did not explain the situation clearly in the text message, Xu Yuan guessed that it was most likely related to the thesis.

"It should be less than a month now. Has the paper been approved so soon?"

Xu Yuan arrived at the door of Tang Shihong's office without any delay, and was still thinking about it.

It is now late October, and it has not been long since I submitted the paper.

You have to know that when he published papers in his previous life, it was normal for him to take sometimes half a year, not to mention two or three months.

Considering that the specific situation could only be known after asking, Xu Yuan did not delay any further and immediately raised his hand and knocked on Tang Shihong's office door.

"Please come in."

Hearing a familiar voice, Xu Yuan pushed the door open and was surprised to find that in addition to Tang Shihong, the department head was also in the office.

"Hello, Director Liao."

He greeted the department head first, then looked at Tang Shihong: "Professor Tang, I'm here."

"Sit down quickly."

Tang Shihong noticed Xu Yuan and quickly asked him to sit down, with a happy and excited smile on his face.

"Do you know why I called you over here?"

"Could it be that the paper has been approved?" Xu Yuan confirmed tentatively.

"Yes."

"We received a reply from the editorial board of Annals of Mathematics this morning. Your paper has been accepted and will be officially published in the latest issue of the journal."

"It will probably take a few days before your name is frequently mentioned in the field of number theory."

Tang Shihong did not keep Xu Yuan in suspense and directly told Xu Yuan the exciting good news.

Liao Fangyi, the head of the mathematics department next to him, also looked delighted and did not hesitate to give praise.

"Congratulations, Xu Yuan, you broke the record of our mathematics department for so many years."

"You published a paper in the Annals of Mathematics as a freshman. The school and department are very proud of you."

Even though Xu Yuan had been mentally prepared, he still felt excited when faced with such news. It took him two seconds to calm down and then he came to his senses and expressed his gratitude.

"Thank you, Director, and thank you, Professor Tang."

"The paper was able to pass the review so quickly because the editor-in-chief of the Annals of Mathematics, Holt, personally went to Professor Pomerance to provide evidence." Tang Shihong waved his hand and continued, "In the reply email, Professor Pomerance gave you a very high evaluation."

"So that's it."

When Xu Yuan heard that his paper was reviewed by Professor Pomerance, who proved the infinite number of Carmichael numbers, he couldn't help but feel some complicated emotions in his heart.

In a sense, his ability to solve the problem of the intervals between infinite Carmichael numbers was based on the work of his predecessors.

Then Xu Yuan suddenly remembered something and quickly turned his gaze to Liao Fangyi and asked:
"Director Liao, I remember that if you successfully publish an SCI journal paper, the department should give you a bonus, right?"

……

　There is still noon, please subscribe and ask for monthly tickets~

　　
　
(End of this chapter)