At this time, Qingcheng still has the flavor of the New Year.

You can see people playing with cannons and sparklers everywhere, and boys are playing with toy guns and engaging in gun battles.

At night, some people set off fireworks to add some flavor to the Spring Festival.

Liu Yichen and Feng Lin arrived at Juzizhou Park. He bought two fireworks and planned to set off fireworks in Juzizhou Park. Maybe it was cold or maybe everyone was watching TV at home. There were not many people in Juzizhou Park, just a few people.

Fireworks were set off, and each one exploded in the sky. They were colorful and beautiful. Feng Lin clapped her hands and was very excited.

After the two set off the fireworks, they went to Dongshan Park opposite and took a walk.

This night, it was just the two of them.

...

February 14th was Valentine's Day, the eighth day of the Lunar New Year. Liu Yichen didn't even have time to spend his first Valentine's Day with Feng Lin. He only gave her a bouquet of roses and hurriedly carried his bag and suitcase.

Went to Qingcheng Railway Station.

There are only two flights a day from Qingcheng Railway Station to Rongcheng. If you miss it, it will be a shame. For this kind of Chinese national training team, missing the first day means you give up.

Although the temperature in Fujian Province is very low at this time, fortunately there is no snow. If there is snow, it is still a primary school and it will not affect the railway operation. Unlike other provinces and cities where there is heavy snow, railway and highway transportation are stopped.

In the early morning, Liu Yichen finally arrived in Rongcheng. He took a taxi from the train station to a hotel closest to Rongcheng Airport. He rested in the hotel for a few hours. At ten o'clock in the morning, Liu Yichen set off for Jiangcheng City.

On the plane, Liu Yichen read a book. The plane was annoying when taking off and landing, but it was very smooth when flying, and there was no feeling when reading a book.

This year's air tickets are particularly expensive. The air ticket from Rongcheng Airport to Jiangcheng Airport costs 1,500 yuan. Ordinary people are simply reluctant to spend so much money to fly.

What was really annoying was that when we arrived at the sky above Jiangcheng, the flight announcement sounded, saying that Jiangcheng Airport was freezing and that the airport was undergoing emergency de-icing operations and it would take half an hour to land.

"This year's snow disaster is really speechless!" Liu Yichen muttered to himself. He didn't expect that he would encounter such a thing again.

But there is no other way, it can only be like this. Compared with those who are trapped on the highway or in the train station and cannot leave, he is already considered happy.

Liu Yichen looked down from the airplane window and looked at the huge Jiangcheng City. This city is the largest city in central China and the most prosperous city in the inland region. During the Republic of China, it was very prosperous and was known as the Chicago of the East and the comprehensive city of Jiangcheng.

Its strength was once second only to the Magic City and ranked among the top in Asia.

"The land here is really flat, with endless plains as far as the eye can see!" Liu Yichen sighed secretly as he looked at Jiangcheng below.

Fujian Province is a typical backwater with eight mountains, one water and one farmland. The only area that is slightly flatter is the area from Shuixian City to Ludao.

But Jiangcheng is different here. Jianghan Plain is a large plain. The only thing he has seen that can compare with this place is Bingcheng. Bingcheng is located in the northeastern plains and the ground is also very flat.

Looking again, Jiangcheng City is located at the confluence of two rivers. The Yangtze River and its largest tributary, the Han River, traverse the center of the city, dividing Jiangcheng City into three, forming a pattern of three towns, Wuchang, Hankou, and Hanyang, standing across the river.

As the largest city in central China, Jiangcheng is not only reflected in economy, but also in education. It is an important scientific research and education base in the country. There are 98 colleges and universities here, among which the number of general colleges and universities and undergraduate colleges is second only to Beijing.

Ranking second in China, Mathematics and Science, a national key university directly under the Ministry of Education, ranks third in the country, with a total of 1.07 million undergraduates and graduate students, ranking first in the world. And the most famous one is undoubtedly 'Wuda'!

Speaking of Wuhan University, the biggest impression people have is the cherry blossoms at Wuhan University! Wuhan University is surrounded by the East Lake and sits on Luojia Mountain, and is known as one of the most beautiful campuses in the country.

Of course, in addition to Wuhan University, there are also Huazhong University of Science and Technology, Zhongnan University of Economics and Law, Huaxia University of Geosciences, Huazhong Agricultural University, and Central China Normal University, all of which are also quite famous.

Finally, after the plane was cross-legged in the sky for half an hour, it finally landed at Jiangcheng Airport. He got off the plane and took a taxi directly to Central China Normal University. He found a hotel to stay here for one night, because he had to register and sign in tomorrow.

Dormitories will be arranged.

After Liu Yichen left his luggage in the hotel, he left the hotel, bought a map at a roadside stall, and checked it out.

It was also the map here that made him realize what a university town is. In addition to Central China Normal University, there are also a large number of universities such as Wuhan University, Huaxia University of Geosciences, Huazhong University of Science and Technology, Huazhong Agricultural University, and South Central University for Nationalities in the surrounding area.

Here, many lakes such as East Lake, South Lake and the Yangtze River constitute the beautiful landscape of this area.

In comparison, Rongcheng, the so-called university town of Ludao, is really inferior. There is no comparison between the two.

At this time, Liu Yichen finally understood why Jiangcheng could develop rapidly and perform very well in the next ten years or so. The education here has provided assistance to the development of Jiangcheng. There are so many talents, even if only a small part can be left, it will be enough.

Let Jiangcheng avoid the worry of lack of talents for development.

Following the map instructions, he went to Wuhan University and bought a map and travel guide of Wuhan University at the entrance of Wuhan University. He finally arrived at the legendary Cherry Blossom Avenue. At this time, the cherry blossoms were still in full bloom. Maybe it was because the weather was colder, but the cherry blossoms at this time were better than before.

It was more colorful, and there were many people here admiring the cherry blossoms, probably because students were not yet in college during the Spring Festival. The number of students he met on Sakura Avenue accounted for about one-third.

After walking around Wuhan University, Liu Yichen felt that Wuhan University was well-deserved as one of the most beautiful campuses in China. It was indeed the most beautiful university campus he had ever visited. Its architecture, natural scenery, humanities and history, etc., were all impressive.

I can't help but let go of my vanity and appreciate it sincerely.

Jiangcheng is mountainous, and Luojia is unique; there is Wuhan University on the mountain!

Regarding this sentence, I came to the campus of Wuhan University and realized why I said this.

After shopping here, it was already eight o'clock in the evening. Liu Yichen went to a nearby shopping mall. When he came to Jiangcheng, he naturally wanted to taste the Wuchang bream, hot dry noodles and shaomai...

This is also a habit of his. When he goes to a place, he always tries the local delicacies, no matter whether the delicacies suit his stomach or not.

...

The next day, Liu Yichen followed the notice and came to the First Affiliated Middle School of Central China Normal University. There were already very conspicuous signs and student volunteers. After Liu Yichen filled in the relevant information and signed in, volunteers took him there.

Dormitories are student dormitories, with 6 people living in each dormitory.

The dormitory is clean and tidy. It is obvious that the middle school has carefully prepared it. Even the quilts are brand new and all kinds of daily necessities are available.

Liu Yichen was the first to arrive at the dormitory. He opened the arrangements for the first round of training. Today is the sign-in, the opening ceremony will be held at 9:00 pm, and the training will officially begin tomorrow.

In the first round of 13-day training, there was an online test, followed by four days of selection exams. Each exam had 6 questions, divided into two days, with 3 questions each day. The exam time was 8:00 am~

Four and a half hours at 12:30! Then there will be 4 lectures, test analysis, and a closing ceremony on February 29th. During the closing ceremony, their results will be announced, as well as the list of candidates for the second round of training.

.

There are 60 official members of the training camp and 40 auditors, which is equivalent to 19 people selected from 100 people to enter the second round of the Chinese national team. This is only one person from five people who entered!

Liu Yichen thought thoughtfully, it seems that this first round of training is very cruel!

Then Liu Yichen picked up elementary number theory and started reading. He had already studied the first and second volumes of advanced mathematics, and now he was studying elementary number theory.

When he was in Qingcheng, he bought books on mathematical analysis, analytic geometry, probability theory, advanced geometry, differential geometry, complex variable functions, real variable functions, differential equations, elementary number theory and other books. This is what he will study next.

Complete, thereby making yourself stronger in mathematics.

Elementary number theory is closely related to what he had learned before. The elementary number theory he read was a book published by Jingcheng University Press in 2003. The authors are Pan Chengdong and Pan Chengbiao. The main book has a total of 673 pages and is divided into nine chapters.

He had studied or been exposed to most of the content when he was studying the Olympiad Mathematical Training Materials before. The book was equipped with a lot of exercises, as well as tips and answers. It was precisely because he had actually learned a lot of related knowledge before that he studied

It didn't feel strenuous to get up, on the contrary, it seemed effortless.

Compared with the previous training and study, looking at elementary number theory now, I can understand, understand and learn number theory comprehensively and systematically.

"The Pan brothers' research on number theory is really impressive!" Liu Yichen thought to himself. After getting the elementary number theory, he saw the author, so he checked online. It was better not to check, but he was shocked when he checked.

, he realized that the two were actually brothers. Among them, Pan Chengdong was an academician of the Chinese Academy of Sciences and a former president of Qilu University. His best field was the study of analytic number theory, and his research results on the 'Goldbach Conjecture' were famous both at home and abroad.

praised by mathematicians.

Of course, this elementary number theory is not his only work. On the contrary, he has many works. Among them, "Goldbach's Conjecture" co-authored by him and his brother Pan Chengbiao is the first comprehensive study in the history of "Goldbach's Conjecture".

This systematic academic monograph has been evaluated by domestic and foreign mathematicians as a "successful re-creation" and "another new work in the treasury of analytic number theory research".

Unfortunately, this old gentleman passed away in 1997.

When Liu Yichen heard someone opening the door, he looked over and realized that his roommate had arrived. The other person introduced himself first, and Liu Yichen found out that he was Zhang Ruixiang from the High School Affiliated to the Renmin University of Beijing, a CMO gold medalist and a perfect score winner.
Chapter completed!