After Wu Zhe received the letter of appointment as an associate professor from President Chang and the 5 million check from the leaders of the Ministry of Science and Technology, the ceremony was over. This is a unique opening ceremony for HKUST.

Wu Zhe returned to the team of his class, and all kinds of congratulations continued. Wang Chao directly snatched the certificate in his hand.

"I'll see, what's written in it? We can't get a professor, but we finally know what a professor's appointment letter looks like?" Wang Chao opened the letter of appointment and read aloud: "Dr. Wu Zhe is hereby hired as an associate professor of HKUST!" ”

"Hey, why wasn't it hired by the School of Mathematics of the University of Science and Technology? Wu Zhe is a doctor of mathematics! Someone next to him was surprised.

Wang Chao said with a smile: "The school is called prescient, one day Ah Zhe wants to get a doctor of physics, a doctor of chemistry or something, then the school has to issue a letter of appointment to him from each college?" ”

was playing, Zhang Detong walked over. glanced at Wang Chao, who was speaking cheerfully.

"Ugh!" Wang Chao hurriedly shut down and stood aside silently. Everyone shrunk their necks and avoided Lao Zhang's eyes. The night is not over!

"Professor Wu!" Zhang Detong stretched out his voice.

"Hey! Teacher, don't scorn me, call me Wu Zhe! Wu Zhe was shouted by Lao Zhang's professor.

"Hehe, that's not going to work. You're a professor hired by the school. Just now, Dean Qi said that your lab is very busy? Lao Zhang squinted at Wu Zhe.

"Oh! It's a little busy, but no matter how busy you are, you still have time to listen to the teacher's teachings. Wu Zhe said with his head drooping.

"Hehe, you dare to ask the leader to intercede for you, where did you learn this atmosphere? That's what I taught you. Hearing this, Wu Zhe chuckled in his heart, it's broken! It backfired.

"Give me all the back checks, if you don't write enough 10,000 words to check today, then you don't have to think about eating and sleeping, I'll accompany you." Get back to the young courtyard for me. Zhang Detong roared filial piety.

As soon as the words fell, a group of people who were still in high spirits just now were all holding their heads and running around.

"Hey! Ah Zhe, you're a professor! If you run like this, do you want an image? Wang Chao shouted to Wu Zhe, who was running first.

Wu Zhe turned around and gave him a look of contempt, and asked Lao Qi to say the favor. It's obviously adding fuel to the fire, don't run faster, wait to be cut!

"Silly fork!" Shen Zhiwen scolded when he overtook Wang Chao.

"Third child, you can scold anything, you can't scold me for being stupid!"

A group of people returned to the classroom of the young courtyard, sighing one by one. Obviously, Dean Qi didn't get rid of their Teacher Zhang, which shows how angry Lao Zhang is in this incident!

A group of science geniuses began to scratch their ears and cheeks. You look at me, I look at you. 10,000 words! How to write?

If you can write 10,000 words, wouldn't it be nice to write it?

"Ah Zhe, what's the matter?" Everyone looked at Wu Zhe.

Wu Zhe spread his hands and said: "Write, how much you can write!" I didn't do it this time! Lao Zhang is really crazy. ”

Then he turned his head to Xu Dong and said, "What kind of excitement did your class come to, but Lao Qian didn't speak." ”

Xu Dong said with a wry smile: "Although Lao Qian didn't speak, if we dare to escape." If you don't do what Lao Zhang said, believe it or not, we will definitely be worse than now! ”

Wu Zhe was speechless, it was really possible for Lao Qian to do that.

Then I remembered one thing again: "Xu Dong, take the time to help the son of the boss of Jiangnan Chunsong, that kid wants to be admitted to our University of Science and Technology." ”

Seeing Xu Dong's doubts, Wu Zhe told him the reason for the matter.

"No, how can we have that time? It's not like you don't know how much work we do. Xu Dong listened with a big head.

This is really not an excuse, the outside of these young courtyards looks at the scenery. But only they know how stressful they are in school, and many people have cried when they do their homework. There are very few of these people who usually go out shopping.

"If you don't have time, take turns. Squeeze in time, this time we owe Boss Song a favor. Wu Zhe also said a little helplessly.

"Then you can also arrange some people from your class to come over, there are more people in your class who have been exempted from taking the course than in our class."

"Hey, hey, hey!" Wang Chao smiled strangely beside him: "This college entrance examination is your major in class 2!" You are all super Mizuki, the young academy that only entered the score line of Beijing University, it is not difficult to tutor a college entrance examination candidate! That kid is not engaged in competitions, and if we engage in competitions, we will be the ones who do it. ”

"Ho! Wang Chao, you're making trouble! It seems that we are not as good as you in the college entrance examination. "There are 2 classes of people next to him who are not convinced.

"I didn't say it, but what do you think? We're invited by the school, yes! It seems that not only is it free, but it was also promised a scholarship at the time. Wang Chao smiled proudly.

"Yes! Wu Zhe also has to pay tuition, and he also came up from the college entrance examination. It seems like it's rare for us to go to a competition? ”

If these words were in the previous sessions, they would definitely be slapped in the face, but this session came out with Wu Zhe. The people in Class 1 were quite silent after listening to it.

"Let's all be like Ah Zhe, why don't you compare?" Of course, the people in class 1 will not be convinced, although Wu Zhe came from the college entrance examination, but because of his age, he is still in their class 1.

"Ha, afraid of you? Compare to compare! "Half-grown children, of course, have a strong sense of winning and losing. Class 2 will definitely not be softened.

Wu Zhe's head is a bit big. This is talking about tutoring, why did the topic turn to the competition.

"Don't make a fuss, you still have to write a check?" Wu Zhe persuaded on the side.

"You don't have to worry about this, and you don't need to participate. On the level of class 2, let you go on that is bullying them! Wang Chao waved his hand at Wu Zhe.

"Blow, blow hard! Wu Zhe, you don't care about this! I want to see what else Wang Dashao is so powerful besides that mouth! ”

Xu Dong's anger also came up, and it was all around the neck. If he still retreats, then he won't be the squad leader.

Yes, Wu Zhe simply stopped squeaking.

No matter how much trouble they make in the young courtyard, they can't go to the sky.

"There's no rush to compete, there must be a bet!" Wang Chao said lazily.

"Which class loses, in addition to tutoring Boss Song's son, I also have to go to the school radio station to broadcast the defeat." Xu Dong didn't hesitate, and said directly.

"Ahem!" Wu Zhe coughed lightly and said, "Just play this matter in your own courtyard, there is no need to make the whole school know." Within a week of the losing class, the person from the other class has to bow first. Is this okay? ”

Xu Dong and Wang Chao glanced at each other and asked for the opinions of the people in the class. Then he agreed to the bet that Wu Zhe said.

"The First Evolution"

Wu Zhe is actually not very optimistic about Class 2, and he just interrupted to save face for Class 2. When you save it, you will be embarrassed and thrown to the whole school.

"How do you compare?" The two looked at Wu Zhe at the same time.

Wu Zhe thought about it and said: "Each has five questions: mathematics, physics, chemistry, biology, and computers. Just don't do the whole topic of the liberal arts. Respondents, just recommend in their respective classes. I'll be the judge for you. If it's okay, go back to your class to discuss the problem. ”

"Yes."

"So decided!"

Wang Chao and Xu Dong replied at the same time. Wu Zhe shook his head, what is this doing? When Lao Zhang and Lao Qian come back, will they be mad when they see this scene?

"Hey!" Wu Zhe stopped the two and said, "What should I do if I check?" ”

"Write a yarn! We are science students, and this is deliberately making things difficult for us. Anyway, whoever of you likes to write writes. I'm going to skip meals and sleep, let Lao Zhang accompany me! Wang Chao said hesitantly.

"Yes, I won't write it! Isn't this thing going to kill us? Isn't it just not eating or sleeping? ”

"It's easy to eat or sleep, but it's hard to check 10,000 words!"

"Anyway, let's stay up together! Lao Zhang is old, can he survive us? ”

A bunch of people don't want to write, okay! This tide is together, and everyone is unified.

Wu Zhe threw the pen away, and he was a professor anyway. They all dare not write an inspection, then they are afraid of a fart.

Soon the first question on the side of Class 1 came out:

dx/dt=A(t)x+f(t)(1)

where A(t), f(t) are periodic with ω, A(t) is a matrix function of n×n, and f(t) is an n-dimensional vector function. Let x1 (t), x2 (t), ,..., xn (t) be the corresponding systems of homogeneous equations

dx/dt=A(t)x (2)

The initial conditions are satisfied:

x1 (0)=，x2 (0)=，…，xn (0)=

Proof: 1. Let x=φ(t) be the solution of (1), then x=φ(t) is the sufficient and necessary condition of the periodic solution of (1) with ω as the period is φ(0)=φ(ω).

2. For any continuous periodic function f(t), f(t)=f(t+ω), the sufficient and necessary condition for the system of equations (1) to have a unique periodic solution (with a period of ω) is that the matrix X()] does not have a eigenroot equal to 1.

Wu Zhe shook his head, do you want to be so ruthless?

This is the first question, this question is very difficult, basically the same level as Wu Zhe's exemption exam, if you don't understand the constant coefficient homogeneous linear differential equations and higher-order differential linear equations, you won't even have the idea of this question.

The people in Class 2 looked at the questions on the blackboard above and thought silently, and they also knew the rules. No one discussed, just took a pen and paper and calculated it below.

Wu Zhe frowned and said, "You guys, don't know it yourself." Deliberately make things difficult for people, then it's not interesting, just throw a few conjectures over. Everyone, stop playing. ”

The old god Wang Chao was saying: "Don't worry, we won't be so scoundrels." If the problem comes out, it can be solved naturally. As long as Class 2 says they can't do it, then don't worry, although this question is not from me, I will go up and explain it to them. It's not too complicated. ”

This is crazy enough, but Wu Zhe knows that Wang Chao has this strength. This kid's mathematical attainments can compete with those graduate students in the School of Mathematics.

Half an hour passed, and no one went up to Class 2. Wang Chao shouted: "You can't just consume it like this, right? Is there still time for the exam? ”

"Rest assured, no one will make it within an hour. Count us out! Xu Dong also replied with a single word.

As soon as he finished speaking, three or four people stood up at the same time in Class 2.

Young! Isn't it good? Wu Zhe looked at it. It seems that the people in Class 2 are not idle this holiday! According to his estimates, there are only one or two that can be solved in Class 2, including the strongest Xu Dong.

"Bright, you go up!" Xu Dong picked the one he was most sure of.

Chen Mingming, who entered the University of Science and Technology with a perfect score in mathematics in the college entrance examination. Although he has never participated in competitions, his mathematical aptitude is not bad.

After getting on the podium, he didn't say much, and directly picked up the gel pen and began to solve the problem.

As the line of calculations began to be written, Wu Zhe raised his eyebrows. Awesome, this idea is very clear.

It seems that with the study of one semester, those college entrance examination candidates in Class 2 have fully adapted to the style of the Shaoyuan. Those people used to focus on the whole subject, compared to the guys who came in by competition in Class 1. There must be a lot weaker in a single subject, but their talents are not bad, as long as they find the right rhythm, then many people can break out.

More than ten minutes later, Chen Mingliang finished writing the final equation. Everyone in the classroom burst into applause, it was not a bet, it was just a simple congratulation among the students.

Chen Mingliang also breathed a sigh of relief, and when he stepped down, the people of Class 2 high-fived him one after another.

Zhang Detong and Qian Feng discussed how to educate these children and rushed to the classroom.

Before entering the classroom, he heard the applause inside, and Zhang Detong said angrily: "Is this a rebellion? Do you dare to make trouble for me? ”

Qian Feng was also a little angry in his heart, what happened to this group of children? However, he still persuaded: "Lao Zhang, don't get angry when you go in, see what's going on?" Isn't it normal for these children to be a little out of line? Our job is to lead them on the way. ”

"Then I still need you to remind them, if not that I want them to go the right way. Today, when Dean Qi pleaded with them, I directly agreed to him. ”

"You! It's also direct, can't you promise Dean Qi first? It's not too late to come back and clean them up. Refuse in person, fortunately, Dean Qi also understands what you mean, and I don't blame you for not giving face. Qian Feng reminded with a smile.

"Sleek, sleek in scientific research? I can't teach a bunch of slick fake academics, I want real scientists who can do their best for the country! Zhang Detong replied sonorously.

Qian Feng arched his hand, he had always admired Lao Zhang's personality.

When the two of them entered the classroom, what they saw was the questions and the full number of answering steps.

Lao Zhang was born in mathematics and looked at the topic. Eyebrows raised: This question is a bit interesting, and then look at the answer. Not bad!

Turning to the bottom, he asked, "Can anyone tell me what's going on?" Let you come back and write the check, it's all written? ”

The birds below are silent, and Wang Chao, who usually dances the most happily, also dare not make a sound.

Seeing that it was not a matter of being so stiff, Wu Zhe had to stand up and say, "Teacher, after we entered the classroom." I also know that I am wrong, but the 10,000-word examination is really a bit difficult for us science students. Even if there is something to say, we can't express it.

So classes 1 and 2 had a game to see what to do during this holiday. Have you made any progress? This is the first question in our class, and it was easily solved by Chen Mingliang from Class 2. Teacher, you can also see the gold content of this question. ”

"Wow! Good job! It seems that the questions in your class 1 are not very good! ”

Qian Feng was very happy next to him, he used to be pressed and beaten by Class 1 in his own class. This is finally a raised eyebrow, so the words of praise are also blurted out.

Zhang Detong glanced at Wu Zhe dissatisfiedly, you can't come up with difficult questions, and look at the old money proudly.

Wu Zhe smiled and said, "That, I'm forbidden to participate in the competition." ”

Before Zhang Detong could say anything, Qian Feng had already applauded: "This is good!" That's it, Wu Zhe, you have been rated as an associate professor, and it's really unfair that you want to end up. ”

Zhang Detong glanced at Qian Feng and said, "You just won the first question, what are you proud of?" Let's get the question! I'll show you the strength of our class. ”

This damn desire to win or lose, Lao Zhang and Lao Qian seem to have forgotten to check.