"Huh? You are also from the Department of Mathematical Sciences? What a coincidence. Me too. My name is Xu Wei. I am a sophomore this year. Come on, I will show you around. I know a lot of people. You can enter many venues without queuing. By the way.

, what do you two call each other?"

Qin Ke was "surprised" and said: "So you are a senior in the same department? That's great. I was discussing calculus with this classmate just now. We didn't come to a conclusion. Can senior brother help me answer a question?"

Xu Wei's face showed joy, he patted his chest and said: "Ask me, I am still very familiar with calculus, which is just a freshman."

"Oh, what we just discussed is that Weierstrass used the monotone bounded sequence to derive a definition of irrational numbers that does not rely on the concept of limits. In this theory, the number root 2 is not defined as the sequence 1, 1.4, 1.41

, the limit of 1.414..., to some extent, there are many contradictions with the Cauchy limit principle. We have just discussed how this contradiction is resolved and evolved in calculus, but we have not been able to

We have reached a consensus, I wonder what senior brother has to say?"

Xu Wei: "..."

Are all freshmen now so aggressive? Do daily discussions involve issues related to the origin of underlying mathematical theories?

Sweat beaded on his forehead. His calculus was okay, but he only mastered the general knowledge in textbooks, such as Cauchy's theorem, Lagrange's theorem, Newton-Leibniz formula, etc., which could not be in-depth.

Have you ever studied such a profound theory of origin? Not to mention him, even a senior undergraduate majoring in mathematics would still be dumbfounded unless he was interested in reading the history of calculus and was familiar with Weierstrass's theory.

Can't answer.

Only because Qin Ke had access to all the universities in the world, all the ancient and modern works and textbooks on calculus at home and abroad, and absorbed almost all of them, was he able to grasp these original theories at his fingertips.

Qin Ke looked very disappointed: "No, sophomore brother, you can't answer it? Then let me change the question. Lagrange proposed that the solutions of first-order nonlinear partial differential equations are classified as complete solutions.

, odd solutions, through integrals, but there are flaws in Lagrangian's own theory. He only discussed the case of two independent variables, and it was later solved by Cauchy. I would like to ask Cauchy how to extend it to n independent variables.

When considering variables, what is the main basis, and what is the biggest advantage of the subsequent solution compared with Lagrange's theory?"

Xu Wei: "..."

The sweat on his forehead became more and more intense, and he opened his mouth but could not say a word.

"You don't know how to do this? Did my classmate answer it just now? Are you from the Department of Mathematical Sciences?" Qin Ke's disappointment revealed suspicion and vigilance.

Xu Wei couldn't stay any longer: "...Hey, junior brother and sister, I happen to have something to do, so I'll excuse you."

Damn it, I’m so embarrassed today!

Ning Qingyun watched the short-haired boy leave in embarrassment, and couldn't help but burst into laughter: "Why are you talking nonsense like this? What about Lagrange and Cauchy? When did I discuss this with you?"

"Hey, to deal with the guy who wants to chat up my good friend without overestimating his ability, we have to carry out academic dimensionality reduction attacks. Academic committee, in order to prevent you from being chatted up again..." Qin Ke smiled and stretched out his hand to hold Ning's.

Qingyun's white and smooth little hands were different from the simple holding in the past. Instead, she inserted her fingers into her slender fingers and held them tightly with her ten fingers.

"You...let me go." Such an ambiguous and intimate contact made Ning Qingyun subconsciously struggle to get away, but she couldn't.

Qin Ke smiled playfully and let go of his hand according to words: "Then I'll let go. I won't care if someone else comes to talk to you later."

Ning Qingyun stared at him with a "don't you dare ignore it" attitude, but Qin Ke had a scoundrel look on his face and was not afraid of her glare at all.

"Bad guy! You bastard!" A cute blush appeared on the girl's pretty face, but after stamping her feet, she finally shyly and timidly stretched out her hand, and gently hooked Qin Ke with the tip of her silky little finger.

big hands.

I... I just don't want to be talked to and disturbed, so... I don't take the initiative to hold hands with this bad guy as intimately as a couple. The girl is thinking like this, but she doesn't know why her heartbeat is so fast and her face is so angry.

hot?

Qin Ke chuckled and clasped his fingers with hers again. Feeling the softness and smoothness of the girl's delicate white hands, his heart was filled with a sense of accomplishment and joy.

Ning Qingyun blushed and lowered her head slightly, letting him pull her forward.

In fact, she was still not used to being held by Qin holding hands while walking in public, let alone holding hands in such an ambiguous way, but there were a lot of college students in Qingmu University here, and most of them were boys.

The young boys passing by looked at her with particularly hot eyes before Qin Ke held her little hand, and some secretly took pictures of her with their mobile phones.

Now all the boys turned around, first looking at her, and then seeing the hands held together by the two of them, they were surprised and regretful, and moved away with regret.

For some boys who boldly stared at him, Qin Ke returned his fierce gaze unceremoniously. Often, the other boy would look away in panic, not daring to look at Qin Ke, who was in full swing.

While the girl was panicking and being funny, she also felt a little bit sweet about being protected, and then she subconsciously held Qin Ke's big hand.

Qin Ke and Ning Qingyun strolled at Qingmu University together.

This is a top prestigious university in Xia State with a long history and is world-famous for science. I don’t know how many high school students stayed up all night studying on their birthdays just to get an admission letter to study here.

The two walked through the lotus pond described in Zhu Ziqing's "Moonlight over the Lotus Pond" and walked through small bridges and flowing water, but most of the water was covered with a thin layer of ice.

Qin Ke asked as he walked: "Study Committee, among Qingbei, do you prefer Qingmu or Beiyan?"

"My father is from Qingmu and my mother is from Beiyan. I have no idea which university I will go to in the future."

This chapter is not over yet, please click on the next page to continue reading! As expected of Ning Qingyun, she opened her mouth by mentioning the two top schools.

But Qin Ke knows that after the results of the national competition are announced today, the doors of these two prestigious universities will be open to him and Ning Qingyun at any time.

“Have you ever considered studying abroad?”

Ning Qingyun shook her head: "My parents are both core personnel engaged in important national scientific research projects. My family members have to go through approval when going abroad. They are so busy, how can they have time to sign for me..."

Qin Ke nodded in understanding, and at the same time he was even more dissatisfied with his future father-in-law and mother-in-law.

Even if you have "everyone" in your heart, you can't forget that you still have a "little family" and a daughter who hasn't grown up yet.

It's a miracle that Ning Qingyun can still maintain such a well-behaved, simple and kind nature in such a family environment.

"If there is a chance in the future, I will find a way to go abroad with you as an exchange student and live and study abroad for a year or two. In fact, I prefer to stay in China and will only stay in China in the future, but sometimes I have to admit that there are

If you haven’t been outside to see a different world, your horizons will be completely different.”

Qin Ke felt this.

It's not because of the insights gained from traveling, but because of the knowledge in his mind.

Originally, his "Mathematical Analysis" only had a Chinese version, and his feelings were not that deep, but many of the "Probability Theory" were in the original English version, and there were indeed many differences between the Chinese version and the Chinese version, which made him realize that foreign knowledge is indeed

There is also a lot of different and fascinating knowledge.

"Okay, we're here." Qin Ke took Ning Qingyun to a large exhibition hall with a strong sense of technology.

"here it is……"

"This is a science and technology exhibition hall with a starry sky theme, but there is also a 4D fireworks display. Now in the capital, we can no longer see fireworks casually. It is good to see fireworks through virtual technology." Qin Ke explained with a smile.

Before Ning Qingyun could answer, a short-haired female student at the door who looked like a student union cadre interrupted with a smile: "This classmate knows a lot. Yes, our exhibition hall here is the most popular in the entire science and technology theme exhibition."

It’s welcoming, so the queue is extremely long.”

She pointed at the long, snake-shaped queue and said: "But we have a rule here. Whoever can complete the challenge here can skip the line and enter the exhibition hall and have priority to visit. Classmate, do you want to join us?

Try it with such a beautiful girlfriend?"

It was probably because Ning Qingyun was so pure and good-looking that she felt close to her, so she specifically mentioned this. If it had been someone else, she wouldn't have had such a good attitude.

Qin Ke smiled and said: "Beautiful senior sister, I saw someone posted yesterday that the questions here are from each college, and students can decide which college's questions to choose, right?"

This call of "Beautiful Senior Sister" made the female student quite happy. She smiled and said: "It seems that you have done some strategies, but oh, yesterday's question bank is no longer valid, and today's questions are all new."

"No problem, I want to choose the Department of Mathematical Sciences."

The female student looked at Qin Ke and said, "Are you a freshman junior fellow student? Okay, please pick a question from ABC."

Qin Ke casually reported an A. The female student glanced at him, shook her head, clicked on the tablet in her hand, and opened the corresponding question number.

"Topic A: The king of a certain country decided to give 100 prisoners in prison a chance for amnesty, but there is a prerequisite: the prisoners need to pass a challenge task."

"The task is as follows: The prison uniforms of all prisoners are printed with numbers from 1 to 100. One hundred number plates with the same number printed on them will be shuffled and placed in one hundred sealed drawers. Each prisoner has 50

I will take this opportunity to open the drawer and find the corresponding number plate on my clothes."

"If found, the prisoner will be judged as a successful challenge. Each prisoner will enter the challenge room individually according to the prize and perform the task. Regardless of whether the task is successful or not, he must leave from another exit and bring back a separate

Cell, no longer able to communicate with any prisoner."

"When a prisoner completes the task, the challenge room will be restored to its original appearance, and the number plate taken out will be returned to the original drawer. The failure of any one of these 100 prisoners will cause the entire challenge to fail, if and only if all prisoners

Only when they all successfully complete their tasks will they be given the opportunity to be pardoned and released at the same time."

"Of course, the king gave all the prisoners a month before starting this mission challenge, so that they can communicate and discuss countermeasures at any time. What are the chances of the prisoners being released?"

The female student pointed at the question and said sympathetically: "Junior brother, there is paper and pen here, you can use it, but to be honest, you are really unlucky. This question is a difficult probability question. There were more than a dozen people in the mathematics school this morning.
Chapter completed!