Qin Ke smiled lightly and ignored such a low-level provocation.

Soon the bell rang, and a professor surnamed Xu, who was nearly fifty years old and had sparse hair, walked in.

The boys quickly sat down and stopped talking.

Professor Xu put the thermos cup on the podium without naming anyone. He opened the ppt and briefly reviewed the content of the previous class before giving a formal lecture.

He was talking about "symmetry groups and interlaced groups". Qin Ke happened to have covered this part in his tutoring last night. Ning Qingyun quickly followed the professor's pace and listened carefully.

Qin Ke also held his chin and tried to listen to the lecture.

The concept of group was first introduced by Lagrange when discussing the permutation between roots of algebraic equations, and then officially named by Galois 60 years later.

A group is a relatively simple algebraic structure with only one operation. It is one of the most important concepts in mathematics and has penetrated into all branches of modern mathematics and other disciplines.

This chapter is not finished yet, please click on the next page to continue reading the exciting content! Whenever symmetry is involved, there is a group, which can be used to establish the basic structure of many other algebraic systems.

The symmetry group refers to a specific type of finite finite error group that contains permutation groups as subcategories, and the symmetry group refers to a group of finite sets of even permutations.

After Qin Ke listened for a few minutes, he discovered that university was indeed different from high school. The professor simply passed on a lot of conceptual knowledge. He mainly explained the derivation and application of theorems, and he spoke very quickly, unless someone raised their hand to ask a question.

Otherwise, the professor will pretend that everyone in the audience knows about it and keep talking.

However, Professor Xu is indeed very skilled. For example, there are some special isomorphisms between small alternating groups and small Lie groups, which are relatively difficult to understand, but he can explain them in a simple and profound way.

Qin Ke also listened with great interest. Although in his eyes, these knowledge are too simple, but now he is still in the stage of "relaxing his brain". Listening to these is like listening to elementary school mathematics courses, which is very relaxing and refreshing.

You can also learn the teaching style of university professors and gain experience for the future.

Qin Ke looked at Xiaobaicai next to him. Well, her eyes were clear and she could keep up with the rhythm. Qin Ke looked around again. Half of the people were confused, and half of them probably understood. Like Ning Qingyun, she completely understood.

You know, I guess it’s no more than a quarter.

While Professor Xu was taking a break and unscrewing the thermos to drink water, Qin Ke approached Ning Qingyun and whispered: "Look at other people, do they feel confident in learning mathematics?"

Ning Qingyun glanced at the situation in the classroom as she was told, and sure enough, she saw that most of the people looked vaguely understanding. She couldn't help but be startled, and then she pursed her lips and smiled softly, with a happy light dancing in her beautiful eyes.

Professor Xu glanced at the two of them intentionally or unintentionally, and frowned slightly, especially when he saw Qin Ke holding his chin and looking relaxed, with a cynical smile on his face. He never took notes, so he was teasing the female student next to him who was very serious in class.

I feel even more unhappy when others study.

He was well aware of the difficulty of his lectures. Ordinary undergraduates would never learn easily. This boy probably didn't pay attention to the lectures and only came here to pick up girls.

He put down the cup unhappily and suddenly started asking questions: "I have just explained the 'solvable group', and now there is a theorem: it is a solvable group. When n is greater than or equal to 5, sn is an unsolvable group. Who will

Prove it?"

As he spoke, he looked towards Qin Ke.

7017k
Chapter completed!