"Is this a trick?" Li Chunfeng was surprised for a long time, as if he had broken a conventional concept.

Zhang Jiuling was also very curious if the concept of throwing away the two sides was not the case, it was a kind of distortion and overlap.

It was like opening a new door. Li Chunfeng observed the Mobius ring in his hand. It seemed like a kind of knowledge he had never been exposed to. He had already mastered geometry very skillfully, but the Mobius ring in front of him seemed to be related to geometry.

However, in this case, geometric calculations, the area of ​​both sides of a piece of paper remains unchanged, but it only sums it up, but it is indeed the same as Gu Xiao said, with only one side.

"I lost." Li Chunfeng looked at Gu Xiao, "But I didn't lose to you, but to your father. This question was made by your father."

"That's right." Gu Xiao also did not deny it.

"Boy! Have a good deed with your father." Li Chunfeng said with a smile, "I got a new question that allows the students of the academy to study hard and study your question. What is the name of the ring?"

"Mobius Ring." Gu Xiao said.

"Why is there such an inexplicable name that is so difficult to pronounce." Li Chunfeng looked at the side and saw the Liuli bottle and asked curiously, "What is this bottle?"

"This bottle is also my father's topic." Gu Xiao put the bottle in front of Li Chunfeng.

Li Chunfeng picked up the weirdly shaped glass bottle, "What's the question?"

"You compare this Mobius ring with a bottle." Gu Xiao said with a smile.

Zhang Jiuling stood aside and listened to the conversation between Gu Xiao and Li Chunfeng. Gu Xiao was two years younger than him at the same age, but his speech was much more natural than himself. Perhaps it was a relationship of high or low. Gu Xiao's birth determined how tall he was. Gu Xiao was almost a little master in the academy.

Knowing that Gu Xiao had entered Li Chunfeng's office as soon as he came to the academy, Li Linfu and Yang Zhao hurried to see Fang Chengxian standing outside the door and asked hurriedly, "What's wrong?"

"You guys are quiet." Fang Chengxian said hurriedly.

"Has Gu Xiao been in trouble again?" Li Linfu asked.

Looking at the two of them with concern, Fang Chengxian said, "Don't worry, there will be no big deal. It seems that Master Li Chunfeng will not criticize Gu Xiao anymore."

"I knew he had a solution." Yang Zhao smiled on his face.

Fang Chengxian looked at Yang Zhao and Li Linfu and said, "You two are really good. Gu Xiao is ignorant and you are ignorant. He is the youngest among us. Sometimes you'd better persuade him before causing trouble. You'd also go to Li Chunfeng's room and mess up the star map arranged by others, which made me scold my father."

Li Linfu scratched the back of his head and smiled awkwardly.

"It's still Zhang Jiuling is sensible." Fang Chengxian said, "As soon as the incident happened, Zhang Jiuling admitted his mistake to Master Li Chunfeng. He was helping you admit his mistake."

The voices in the office still did not stop.

Li Chunfeng looked at the glass bottle in his hand and was curious. It seemed that it was indeed related to the Mobius ring. "This bottle is very particular."

"Mr. Li Chunfeng, in fact, the method of making this bottle is wrong." Gu Xiao continued, "There is also a bottle called Klein Bottle. This Klein Bottle is magical. Even if all the water in the ocean is put into this bottle, it will not fill the bottle, which means it is a bottle that is not filled with water."

"Is there such a bottle?" Li Chunfeng was puzzled.

"How to say it, according to my father's statement, the legendary bottle was inferred based on inferences. It cannot be made in this world, and can only be made under certain special circumstances. The mystery is the noodles. There are several sides of this bottle, just like the Mobius ring. I won't talk about the specific mystery boy. I will regard this bottle as a boy's apology and say goodbye."

"Mysterious?" Li Chunfeng said with interest in the Klein bottle in his hand, "This bottle is of particular importance?"

Gu Xiao walked out of Li Chunfeng's office and breathed a sigh of relief. Seeing Fang Chengxian and Li Linfu, Gu Xiao said, "It's okay, let's go back."

Outside the academy, Li Tai received the first batch of students from Goguryeo. The envoys from Goguryeo respectfully said to Li Tai, "Your Highness, these are all Goguryeo children who hope they can learn your knowledge in the academy, which is also what Your Majesty allows today."

"Come to the academy?" Li Tai looked at the more than thirty children behind the envoy, all of whom were about ten years old.

"Is there anything wrong?" The envoy of Goguryeo was puzzled.

"That's the case." Li Tai said, "You all know that learning in academy does not cost money, but the academy also has a rule that you can stay in the academy without spending money to study, which means you can only be from Central Plains, which means you have the household registration of our Tang Dynasty. If your children want to enter the academy, they will have to pay a fee of 1,000 yuan a year."

"One thousand guan a year?" The Goguryeo envoy was stunned, "But your Majesty has not mentioned this now."

"He just said that you allowed you to study in the academy, but the rules of the academy must be followed." Li Tailei said without any warning.

The Goguryeo envoy said, "But some students in Tubo can also study in academy without spending money?"

"That's a licensed college." Li Tai said.

"In other words, only the students with chartered can enter the academy without spending money?" The Goguryeo envoy was a little caught off guard.

"Yes, have you not brought enough money? Why don't you come back after you have enough money?" Li Tai's fat face smiled.

The Goguryeo messenger looked embarrassed and was about to leave, but stopped and said, "By the way, our Goguryeo King's younger brother has been studying in the academy for some years, and is now sixteen years old. The Goguryeo King thought that he could take his own king back to Goguryeo."

"In fact, there was an agreement on this matter at the beginning. When will your brother of King Goguryeo leave the academy, we have the final say."

"What do you mean? That's my brother of King Goguryeo. Could it be that our king's words are not counted? Do you want the King Goguryeo to come to the academy in person?"

Li Tai sneered, "This envoy, have you King Goguryeo forgot something? Do he still remember who pacified Goguryeo for him? You King Goguryeo really doesn't matter. Even if you King Goguryeo comes in person, we will see if we agree or not!"

"You!" The Goguryeo envoy pointed at Li Tai and said angrily, "I want to go to your emperor to speak His Highness the King of Wei's words intact."
Chapter completed!