Through those documents, Zhao Xiancai not only gained a deeper understanding of some mathematical theorems, but also learned about their historical process from unsolved mysteries to becoming theorems. He understood this process and the way mathematicians in history studied various mathematical problems.

The experience was also a great pleasure for Zhao Xiancai when he read the literature.

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Hilbert's question 12 can be said to have started from Kronecker. When Kronecker was studying domain expansion, he noticed some strange phenomena related to Abelian expansion. If we start from the field of rational numbers,

q starts to do any Abelian expansion, then the extended domain k seems to always be included in a certain cycloidal domain.

This conjecture was the Kronecker-Weber theorem that later became a theorem. Under normal circumstances, since the theorem is called the Kronecker-Weber theorem, the person who proposed and finally proved it should be Kronecker and

Weber.

But the actual situation is not that simple. Heinrich Weber did give a proof and it was accepted by most people. However, 100 years later, a mathematician discovered that Weber's proof contained some

Error, so the proof cannot be established.

However, ten years after Weber's proof, Hilbert also gave his proof of Kronecker-Weber's theorem, and his proof method was simpler.

So although people discovered some errors in Weber's proof 100 years later, the Kronecker-Weber theorem still holds, but it was actually proved by Hilbert.

Zhao Xiancai didn't know much about the interesting history of the Kronecker-Weber theorem before, and he only discovered it this time when he checked the relevant literature.

But once you devote yourself to something, time flies very quickly. Zhao Xiancai felt that he would leave his hometown and go back to school in just a few days.

On the eve of last New Year's Eve, the completion of the task of "complete the study of all professional courses in the chosen major of the university" really brought Zhao Xiancai a lot of gains.

The mathematics subject level has been upgraded from lv3 to lv4, and the [flow state], which has been upgraded to lv2, has been activated, an active skill that can increase learning efficiency by 50%. During this period, research on Hilbert's 12th question and related literature

During the reading process, Zhao Xiancai did feel that his learning efficiency in mathematics had indeed improved significantly compared to before.

Since Agricultural University starts nearly a semester later than Beijing University this year, the school dormitories will not be available if you go early. Therefore, Yu Shujun wanted to go to the capital with Zhao Xiancai, but she had no chance this time.

Zhao Xiancai, who is on his way back to Beijing alone, is still immersed in the issue of Abel's expansion. There is no one around to disturb him, but he feels lucky.

find a partner?

Can the object help solve the construction problem of Abelian expansion over the whole real field? Can it help solve the twin prime conjecture, or even the general conjecture proposed by Polignac? Can it help solve the Goldbach conjecture?

cannot.

Not only cannot they, they will bother you to solve these problems.

If that's the case, what else are you looking for?

"This is the first time I feel that time flies so fast while taking the high-speed train from Luzhou to the capital."

When Zhao Xiancai heard the station arrival reminder mentioned by the train announcer, he finally returned from the world of mathematics to the real world.

"This [Flow State] is easy to use, but it consumes one's own energy too quickly. One's own energy consumption increases by 80%, which is almost twice as much as before.

I was full after eating at 12 noon, and I originally didn’t feel hungry until 6 pm, but now if I keep turning on this [Flow State] skill, I will feel hungry at a little after 3 pm.

Fortunately, I was prepared and had some bread and water in my backpack.

I really don’t know how much this [flow state] will increase learning efficiency and energy consumption when I upgrade to level 3, and what is the upper limit of its level.”

Zhao Xiancai picked up his luggage and slowly walked out of the train car while queuing up, chewing on a braised chicken drumstick and thinking to himself.

Because he no longer continues to study mathematics, Zhao Xiancai has also turned off the [Flow State] skill, and the chicken drumsticks he is gnawing are not his dinner, they are just for him to satisfy his hunger.

After returning to school, he would have to go to the cafeteria for dinner.

It took some time to take the subway from the train station to Beijing University. However, at this time, Zhao Xiancai stopped studying the problem of Abel's expansion and began to observe all kinds of passers-by on the subway.

Running around like this in a boring way, until about six o'clock in the evening, Zhao Xiancai finally returned to the dormitory. By this time, the other three roommates in his dormitory had already arrived at school.

"Have you eaten?"

After returning to the dormitory and putting his suitcases and backpacks in the dormitory, before preparing to go out for dinner, Zhao Xiancai asked the others.

"No, let's go together."

"I haven't eaten either, how about you bring me one?"

"Go away, you can bring some if you want. Just call daddy and I will bring you one."

"Forget it, then I'll go eat with you."

The ones who responded to Zhao Xiancai were Zhang Qiuyu and Ding Daoliang. As for Cui Pingge, he was having sex with his senior partner at this time, and Cui Pingge was still shouting "baby" and "baby".

I really don’t know how the senior who said she only talked about spiritual love at the beginning could stand Cui Pingge’s behavior now.

"Why did Cui Pingge become like this when he came back from winter vacation?"

On the way to the canteen, Zhao Xiancai asked Zhang Qiuyu and Ding Daoliang "sadly".

"After the relationship between the two of them took a further step last semester, Cui Pingge has already started to have this trend. Now it's like this after winter vacation. It's normal."

"But if he does this every day in the dormitory, will you be okay with it? We need to talk to him when we get back later and ask him to at least restrain himself in the dormitory. There are still three single dogs in our dormitory."

"What single dog? You are belittling yourself. I am not a dog. I am a single nobleman, a lone wolf walking alone in the grassland. But Cui Pingge is really too arrogant now. He will go back to the dormitory later.

Then I need to talk to him and ask him to restrain himself."

…

The few of them chatted like this and soon arrived at the school cafeteria.

"I'll go, you've eaten a lot more than usual today."

During the meal, both Zhang Qiuyu and Ding Daoliang were a little surprised after seeing Zhao Xiancai who had a huge appetite.

"Not only today, but also from now on. You will get used to it later." Zhao Xiancai felt that they were making a bit of a fuss.

After eating, Zhao Xiancai also bought some bread, peanuts, almonds, cashews, walnuts and other snacks and dried fruits and moved them to the dormitory in case of emergency.

Bread mainly pads the stomach, while dried fruits have a very magical effect on restoring physical energy, because they contain a large amount of protein, vitamin B, vitamin E, calcium and iron, as well as vegetable fats.

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