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Sure enough, just after Ning Chen sat backstage for a while, Qiu Chengtong and Feng Lan came backstage.

"Ning Chen, I'll treat you to a meal at noon. I was in a hurry yesterday and didn't have time to entertain you."

Qiu Chengtong personally expressed his intention to entertain him, and Ning Chen naturally would not refuse, so he explained the situation to Lin You and Song Xiyun on QQ so that they did not have to wait for him.

"Well, Ning Chen, you should be busy first. Then my senior sister and I will go back to Yanda University first, and then contact us after you finish."

Lin You and Song Xiyun both understood this, and the distance between Yanda and Shuimu was very close, so it was very convenient to go back and forth.

We had lunch at a nearby restaurant, but in terms of quality, this restaurant was a bit more upscale than the Jiangshan Yufu near Shengzhou University.

In addition to Ning Chen, Qiu Chengtong, and Feng Lan, several professors from the mathematics department also came over, most of whom Ning Chen had met during the training camp.

"Ning Chen, just order what you want to eat, no need to be polite." Qiu Chengtong said with a smile.

The prices of the dishes on the menu were not cheap. After some evasion, Ning Chen casually ordered a dish and handed the menu to Qiu Chengtong.

Ning Chen would definitely not feel particularly comfortable eating with these big guys, but this was something he couldn't escape.

"We have work in the afternoon, so we'll have tea instead of wine. Ning Chen, I'm glad you accepted my invitation and gave us a very exciting public class."

Ning Chen also agreed with the suggestion of not drinking. If he didn't drink, the time of a meal could be greatly shortened.

Soon, the waiter served dishes one after another, and Qiu Chengtong also motioned for everyone to use their chopsticks to eat.

Ning Chen tried his best to appear less reserved. Of course, it is still necessary to be cautious in words and deeds. After all, too much talk leads to mistakes. At this kind of dinner, it would be better to listen to what they have to say.

However, because Ning Chen is the protagonist of this dinner, the topic often falls on Ning Chen.

"Ning Chen, we really didn't expect you to do such a good job in research on Qiu Chengtong's conjecture. It seems that we underestimated your ability too much."

The professor who spoke was the same professor who suggested Ning Chen change his subject at the training camp.

Ning Chen didn't take this matter to heart. Judging from the situation at the time, changing the subject was indeed the safest choice.

It’s just that if you always put safety first when doing research without any courage and hard work, it is not an advisable thing.

"Yes, Ning Chen, when we learned that you published a paper in the Journal of the American Mathematical Society, we were all very surprised. We all thought that you did not participate in the final defense because you did not develop a project. Unexpectedly, I just finished the subject in advance.”

Qiu Chengtong saw this and said with a smile:

"If we look at the goals set during the thesis defense, Ning Chen has indeed not completed his project. Ning Chen wants to solve the entire Qiu Chengtong conjecture, and the work he has done now is only one-third of the project goal at most. Just one.”

After Qiu Chengtong finished speaking, everyone couldn't help laughing.

Everyone could hear that Qiu Chengtong was praising Ning Chen in a different way. Of course, Ning Chen could achieve such results at this age, so who would be stingy with praising Ning Chen.

What Ning Chen didn't expect was that at the dinner table, Qiu Chengtong did not invite Ning Chen to study at Shuimu University again.

Originally, Ning Chen had already prepared the words to answer the questions, but it seemed that Ning Chen was wasting his time.

Ning Chen felt that because Ning Chen had already expressed his attitude towards this matter before, maybe Qiu Chengtong didn't want to make Ning Chen look too embarrassed at the dinner.

After finishing the meal, everyone came out of the restaurant together.

"Ning Chen, you can wander around Yanjing at will these two days. The two times you came to Shuimu University before, you spent all your time studying and researching. Please relax a little this time."

Ning Chen felt that this arrangement was good. Taking time to relax and adjust occasionally would be more conducive to future research work.

After returning to the hotel, Ning Chen contacted Lin You and Song Xiyun and told them that he could arrange his time freely.

"Then let's meet at the east gate of Yan University later."

The east gate of Yanda is closer to Shuimu University. It can be reached in ten minutes' walk from the hotel where Ning Chen lives.

"Okay, I'll see you later."

Ning Chen tidied up his appearance a little, then put on his shoes and went out.

The three met at the east gate of Yan University. In fact, Lin You and Song Xiyun had already met Ning Chen in the morning open class, but Ning Chen did not see Lin You and Song Xiyun.

After all, there were too many people sitting down there, and Ning Chen's energy was focused on explaining the problem, and he had no time to find where they were.

"Ning Chen, what you taught in the open class this morning was really good! I think I gained more from any open class I took in the training camp before."

"Yeah, I thought you would be nervous when you go on stage, but I didn't expect you to have no stage fright at all."

Facing the compliments from Lin You and Song Xiyun, Ning Chen smiled and said:

"Actually, I'm quite nervous, but you didn't see it. How about it, can you understand what I'm saying?"

"Well, I can understand part of it. Because I have carefully studied your paper before and looked up a lot of relevant information. Otherwise, I might not understand even a little bit." Lin You said.

"I probably understand the overall idea, but I don't know how you could come up with such a wild idea. As for the details, I think you'll have to give me a few more months to study it, haha."

In fact, people like Lin You and Song Xiyun who can understand part of Ning Chen's thoughts are already considered very powerful.

After the whole open class, almost no one understood anything, and I'm afraid there are a lot of people there.

The three of them walked around the campus while chatting.

Ning Chen is very satisfied with the environment on the Yanda campus. Compared with Shuimu University, there are many traditional Chinese-style buildings on the Yanda campus, and the entire campus environment is full of ancient charm.

In addition to the beautiful scenery, a relaxed mood is also very important. If he came here before the open class, Ning Chen felt that he would not be in the mood to appreciate these scenery.

"Ning Chen, when is your flight back to Shengzhou?"

"The flight back is for next Monday. Professor Qiu helped me book a hotel for a few more days. I also want to stay in Yanjing for two more days."

"Then do you have any other plans these days?"

"I don't have any plans for the time being. I might talk to Professor Qiu about mathematics again."

"That's great. How about we go shopping in Yanjing together tomorrow? Senior sister, do you have time?"

"Okay, anyway, I've almost reviewed everything for the final exam."

Because tomorrow is Saturday, neither Lin You nor Song Xiyun have classes, so everyone quickly reached an agreement.

In the evening, after the three of them had dinner in the cafeteria of Yanda, they stayed on campus for a while.

"Ning Chen, do you want to go back after running 5,000 meters?" Song Xiyun joked.

"Let's wait until the next time you come to Shengzhou. I didn't bring my sportswear this time."

"Okay, you are quite tired from the open class today. Go back and have a rest early. You have to go out to play tomorrow morning."

"Well, I'll see you tomorrow then."

The next day, Ning Chen packed his things and was about to set off when he saw a message from Lin You.

"Sorry Ning Chen, I had a little diarrhea today and I'm still in the bathroom. Otherwise, you and my senior can go together today."

After seeing the message from Lin You, Ning Chen quickly replied:

"How's it going? Is it serious? Do you need to go to the hospital?"

Ning Chen thought that they ate the same thing last night, so why was he fine?

"It's okay, it's not serious. You two can just go and play. If I feel better soon, I might go find you."

At this time, Song Xiyun also sent a message.

"I saw after I went out that Lin You said he didn't have diarrhea anymore. So are we still going today?"

Ning Chen learned that Song Xiyun had already gone out, and it would not be good for her to say no at this time. After all, girls would spend a lot of time putting on makeup and dressing up when they go out.

"It's okay. Lin You said he'll be fine after a while. He might come to see us. I'm going out too."

Song Xiyun sent an "OK" gesture, and a few minutes later, the two met at the agreed place.

In Yanjing in December, the weather is already very cold. Today, Song Xiyun is wearing a beige plush jacket on the upper body and a gray loose skirt on the lower body with leggings, which keeps her warm without looking bloated.