Originally, he only came up with a simple question, and Tang Yi was ready to be ridiculed when he first drew the triangle. However, when time gradually passed, he realized that something might be wrong.

Pythagorean theorem may have been known in detail in the original world, and because this theorem is too common, he felt it was quite simple. However, after about two hours, he looked at the frowns of the old and the young, and suddenly remembered another name of the theorem.

Pythagoras Theorem!

The sum of squares of two right-angle sides is equal to the square of the oblique side. It is indeed simple to say that. In that world, only elementary school students know how to use it as the original formula for inference and calculation. However, if there is no such foundation, it is so difficult to prove it! This is something that the great mathematician Pythagoras spent his efforts to prove it. Thinking of this, he couldn't help but feel embarrassed.

It's really bad for me to make things difficult for others like this...

Using juice as a cover, he hid behind the teacup and laughed secretly. This was the fourth cup, and it was indeed a bit late. He promised Xiaoxue that he would go back soon. I guess she was worried about it.

The atmosphere in the room was a little nervous. The warm magic light illuminated the luxurious decorations on the four walls. The old and the young were not talking. They were burying their heads on the table to solve the problem. The noble lady named Catherine looked at it with interest at first, but later she saw that two people had not solved it for a long time. She also curiously thought about the "simple" deduction question. She had no foundation in this area, so she naturally couldn't enter. She just took a quill pen and drew it on the parchment paper. Seeing Tang Yi suddenly stood up, the few people turned their eyes to him.

"Uh...this...you guys have thought about it slowly. The answer is 5. My wife is still waiting for me. Sorry, let's go first."

He bowed and wanted to say goodbye, but Christina grabbed him: "No, this question is so difficult, I can't solve it. Don't leave now, let me tell me how to prove it."

The old man also said, "This time the bento settlement is ready, but, young man, is this really a question that can be proven?"

He heard his tone full of doubt, obviously thinking that the question was unsolvable at all. Tang Yi coughed twice and felt a little dissatisfied. From the beginning, the old man looked down on him. That's fine, he would have to hinder his time to go back to see Xiaoxue. He picked up a quill and dropped it on the parchment paper.

However, when the first stroke was taken, he felt something was wrong.

Yes, I have used Pythagorean theorem too much, but where does its proof come from?

I was nervous, but I could not retreat at this time. Anyway, I had more methods of proof than people here. I explained and drew auxiliary lines one by one. Then, if I failed, I started from scratch... and failed again, and then I started from scratch...

After repeating this for a while, Tang Yi felt quite ashamed, but Christina's eyes widened wider and the old man Stanley's expression became more and more serious. Finally, when a long breath came out, the great theorem of the sum of squares of the two right-angle sides was equal to the square of the oblique side finally appeared, and then sixteen plus nine squared again, finally proved the result.

"Ah-I haven't proved it for a long time, I'm a little unfamiliar. I really didn't expect this to be so difficult to prove..." He turned his head and looked at the two people beside him, "Uh? What's wrong?"

"No, nothing..." Christina stared at him through her big glasses, showing a look of admiration, "Okay, so amazing, I haven't thought about many methods..."

"Haha, it's okay..." Tang Yi smiled embarrassedly, then jumped up, "Oh no, it's already late, Xueer must be very worried. Mrs. Catherine, Mr. Stanley, I'm really leaving, sorry."

"It's nothing, I'm sorry to delay Mr. Rezaduk so much time. Christina, please send Mr. Rezaduk down."

"Okay, Al comes with me." Christina said, pulling Tang Yi's hand and running out the door. Only the old man Stanley was still staring at the pile of parchment in a daze. After a while, Catherine said, "Teacher Stanley, is that Al really amazing?"

"...Of course, of course." After shaking his head for a while, Stanley exclaimed a moment, "Just judging from the derivation methods he used, his erudition is far above me... No, it should be said that he has far surpassed Atroca's current level. Genius, what a genius..."

After all, an old scholar like this still has his advantages. In the same field, when they meet more knowledgeable people, they will be brave enough to admit their shortcomings. The lady named Catherine frowned, and she also saw that Tang Yi did have some skills, but she did not expect that she would be praised by Stanley.

"By the way, which child is this young man from? I guess he has such profound knowledge and knowledge, he must be of a low origin?" After admiring for a while, Stanley remembered to ask about his background. Mrs. Catherine shook her head: "According to him, he is not a noble, but it is probably unlikely. Most people will not have such a good temperament. They are probably the savior of a certain family. Is he that powerful?" What she guessed was almost the same as Sophia had guessed at the time. It was probably believed that this man was a noble descendant who had been hiding after committing a crime. There were not many similar things these days.

"Just just look at his derivation method, we can know that he is not only profound in his attainments, but also deduced it on the spot, which shows that this is not taught by people. If such a person is not a genius, I really can't find someone who can compare with him." The old man sighed, "I started studying erudition theory twenty years ago. I thought I should be one of the best in the empire, but now I realize that I am too arrogant... Ha, to be honest, His Royal Highness the Princess has always disagreed with me about my revision of erudition, right?"

"Catherine is no longer a princess, so don't call her teacher that. Besides, the teacher suddenly changed her erudition after reaching the peak of alchemy. Of course, there is a reason for the teacher. If she really doesn't agree, Catherine wouldn't ask the teacher to teach Kna specifically."

"Haha..." the old man smiled, "Catherine, don't I know your personality? Even if I don't agree, I'm afraid I won't say it out. Teaching Kna is just because she likes such a game. Speaking of which, alchemy must be combined with erudition theory to reach its peak. However, compared with the development of alchemy for thousands of years, the foundation of erudition theory is still a little low. I'm afraid I can't see the result of the fusion of the two in my lifetime... Yes, since Kna doesn't like to let me, the old man, teach her, Catherine, you might try to ask that boy to be her teacher, which should be better than me."

Mrs. Catherine laughed after the veil: "It seems that Kna has caused you a lot of trouble for the teacher these days."

"Haha, trouble is a trivial matter. But in this regard, Kna does have a considerable talent... By the way, I thought about the matter you asked me, and I'd better tell you. The main reason why I went to Denma this time was that Elvis had come to me. Although I don't know what was going on, according to him, it seems that they have found an ancient alchemy achievement, so I invited me to study it together."

"The ancient alchemy achievements?" Catherine thought for a while, "Did Senior Elvis say what it is?"

The old man shook his head: "You also understand that such things are kept very secrets. Once you join in, it will be difficult to get out. I didn't want to join in. It happened that your Kna came to Wanghai. I remembered Elvis' expression at that time and was always uneasy, so I planned to leave for Danma and find out the situation. In this way, there will be some time to meet old friends there, but once you join in, I think there will be few opportunities to teach Kna, so..."

"Teacher, you have to be careful." This sentence was blurted out by Catherine, and the old man smiled: "Don't worry, it shouldn't be a big problem. No matter how powerful the Wall family is, they will not dare to do anything to me."

He gave a noble ceremony and retreated from the door: "Even though the title has changed, in my heart, His Highness the Princess is always the Princess. From the standpoint of an old man, His Highness, please seize your youth."

"Thank you for your concern, Katherine remembers it in her heart."

The door was gently closed, and the old man's figure disappeared outside the door. Catherine sat on the chair beside her. After a while, she lazily picked up the necklace and bracelet beside her, imitating Tang Yi's magical movements, but she sighed softly.

"...Teacher...I'm not disagreeing with your ideas, but have you ever thought that any improvement in skills will always be used first..."

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In the "Pu, pu" sound, the little girl wearing big glasses pulled Tang Yi and ran off the cabin, and stopped before she arrived at the lower level.

"So amazing, amazing, so amazing, Al, you are much more useful than that old man..." She clenched her small fists with both hands, and little stars appeared behind her big glasses. Tang Yi smiled: "Don't talk about others that way, that's the real person with real talents. I'm just blind. It's so late, I have to go back, you go to bed. Children need time to dream."

"I said that they are not that young!" Christina clenched her fists and jumped up to protest, then followed Tang Yi with a trot, "Hey, Al, let's do it, can you be my teacher? I'll just say that, I'll tell my mother that she will definitely agree."

"Stop messing around, I'm really confused. Didn't you see that I did it for a long time before I got that question? I'm really confused. I can't be your teacher."

"But we haven't done it. Didn't you see the old man's expression? Oh oh... so frustrated, so embarrassing, haha, let him know that he is amazing!"

"I'm just talking nonsense. Stop messing around, goodbye," he pulled open the cabin door where he lived, and then closed it with a "bang". The little girl rushed up and wanted to push it open, but heard a sound inside, and Tang Yi had already put down the latch.

"mean!"

She pushed outside the door twice, but finally had no results. She clenched her fists and shouted, and went back upstairs angrily.

"What a weird little girl..." Shaking her head, Tang Yi looked at the bed inside the cabin. When she saw him coming back, Xiaoxue sat up from the bed in surprise. Her upper body was covered with a quilt, and her delicate and delicate body suddenly showed her white, tender and smooth body. Seeing that she wanted to get up from the bed like that, she rushed over and wrapped her quilt: "Why get up? Aren't you cold?" He knew that Xiaoxue was slow to feel this aspect, so he always felt very distressed.

"Yes, it's a little cold..."

Seeing Tang Yi's expression, Xiaoxue shrank her body wrapped in the quilt and said timidly.

"Then you still ran out?"

"I'm worried about you, you said you'll be back soon..." Xiaoxue said with a grievance.

"Uh... I'm sorry, it's me wrong, but... let me see if you're so delicious..." He put his head on Xiaoxue's neck and sucked gently. A shy chuckled in the room. After a while, the candle placed on the bedside was turned off, and the room was in a warm and infatuated atmosphere.

In the quiet night, the Silver Viper passed through the mist shrouded on the Iron River and sailed peacefully towards the direction of Damma. After a while, a little black shadow flew from behind the ship, and with a blink of an eye, the elf-like woman stretched out her dragonfly wings, paddled the water surface, and galloped towards the west.

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The next day, the originally gloomy weather began to clear up, and Tang Yi and Xiaoxue were buried in the cabin and did not dare to go out because when they saw him, the guys who were traveling with him clamored to him to perform the show. Originally, it didn't matter to him, but Xiaoxue was still a little scared in such an atmosphere. In order to avoid trouble, she simply hid in the cabin. However, after noon, the little girl named Christina came to the door again. This time she was very excited to be unable to give up. She kept slapping the door with her hands outside. Tang Yi was a little afraid that her hand would be damaged. In desperation, she had to open the door and go out. This time, Xiaoxue was unwilling to leave him and followed behind with his arm.

To be honest, although Christina is a little lively, she is definitely cute. Perhaps it is because of this reason that Xiaoxue did not reject her much. Because of this, Tang Yi is willing to do Christina a favor, because according to her, as long as Tang Yi meets the old man Stanley again, he might be able to give up being her teacher.

She was speechless, but Tang Yi naturally understood the meaning. As long as she compared Old Stanley again, he would have no shame to be Christina's teacher again. However, he might not really understand the things in this world, and he probably didn't understand the questions he had asked. After thinking about this, he would happily agree.

When we arrived at the second floor, it was still the room yesterday. The guard at the door asked to remove Xiaoxue's saber, but Xiaoxue refused. Christina didn't care about these trivial matters, but the guard still refused. He waited until the little girl went in and asked her mother to let her go. When he entered the room, Katherine and Stanley were already waiting inside. Mrs. Catherine was still wearing a veil and dreamy face, wearing a gray long dress. Stanley was no different from yesterday's outfit, but her eyes were much softer.

"Mrs. Catherine, Mr. Stanley, this is my wife Xueer, haha... She has always been timid and does not say hello to others. I hope she won't be surprised..." Xiaoxue couldn't understand everyone's words, so Tang Yi could only find this reason to make a perfunctory decision. Everyone made a few polite words, and Stanley immediately got to the point.

"This time I asked Mr. Rezaduk to come up because I have always had a difficult problem. I want to ask for advice..."

The old man seemed to be a science madman, and he didn't have much courtesy. He directly took out a few pieces of parchment paper that had been prepared long ago: "In fact, it is just such nine squares that require that one to ninety-nine numbers be filled in, and finally make the horizontal and vertical numbers consistent with all of them. I don't know if Mr. Rezaduk has any knowledge about this..."

The erudition system at this time has not been perfected. People who understand the questions on one hand often do not understand the questions at the other hand at all. The old man seemed to have prepared many questions, and it is still the first one at the moment. However, Tang Yi knew about this question. As soon as Stanley put the parchment on the table in front of him, Tang Yi murmured: "Nine Palaces Picture."

Such a question was too simple for him. Moreover, since he had agreed to Christina, he had to do his best in principle and immediately picked up a quill pen to fill in the answer. Although the text of this world is different from that of Chinese, the numbers and punctuation marks are similar. He had figured it out for a long time, otherwise he would not have been able to prove the three and four cubes yesterday. Seeing him filling in the nine grids casually, Stanley's expression was quite "a shaking tiger body". Then he frowned and took out a chart of four horizontal and vertical lines, a total of sixteen grids. This time he didn't say much, Tang Yi filled in the numbers one to sixteen. The numbers from horizontal, vertical, and diagonal are still the same.

Stanley's eyes became more and more serious, and his hands trembled slightly to pull out another piece of parchment, but this time there were 5 spaces in each horizontal and vertical direction.

This time it was a little trouble. Tang Yi held the quill in his hand and thought for a while. Xiaoxue felt bored and walked into his arms from the seat next to her to sit down. Tang Yi smiled and hugged her tightly: "It's okay, it'll be fine soon."

Their behavior did not arouse the displeasure of others. The cultivation of the nobles has always been about not being surprised when things happen, and this is not a big deal. Therefore, Mrs. Catherine did not have any strange expression. Because the matter was related to herself, Christina took Tang Yi's hand and whispered: "Hurry up." Stanley stood in front of her nervously, bowed slightly, and followed the quill on Tang Yi's hand. After a while, Tang Yi fell down the tip of the pen and filled in twenty-five numbers one by one. Stanley's whole body began to tremble.

"Genius, genius..."

He murmured, and held up the parchment with his hands tremblingly, "I didn't expect... It took me nearly five years to solve this problem. I thought no one could solve it anymore, but I couldn't expect... Mr. Rezaduk, you see, I have a guess. If the twenty-five grids can achieve such an effect, then thirty-six grids, forty-nine grids... can all be..."

This time, he had already used respectful words in his language. Tang Yi smiled embarrassedly: "It's true. The magic square has regularity. Even if it is ten thousand squares horizontally and vertically, it can achieve such an effect. Look, are there other questions? Haha... I actually only understand this aspect, other aspects..."

He thought that Stanley would give him several questions that he didn't understand at all, but the old man interrupted him, and his expression was very respectful: "You call this... a magic square?"

"Ah, that's right, I call it that way. It includes odd-order fantasy squares and even-order fantasy squares. But I actually have only a slight understanding of these things, and it will be very troublesome to talk about them... Mr. Stanley, do you see if there are other questions..." He was only in high school mathematics level. Because too many things were imposed extracurricular, he dabbled in the course of fantasy squares. It was not humble to say that it was a slight understanding. The old man immediately shook his hand.

"No, no, no... With Mr. Rezaduk's attainment in erudition, no one in the entire Atroca Empire has the qualifications to give you questions. I am really disrespectful to my attitude in the past few times."

Tang Yi had no high evaluation of herself, so naturally she couldn't be angry. Seeing his respectful attitude, she felt embarrassed. Christina had already screamed: "Look, Old Stanley, you lost, don't you want to be my teacher in the future!"

"Don't be rude to Teacher Stanley, Kna!" Catherine stopped her in a gentle tone, and then turned to Tang Yi, "I didn't expect that Mr. Rezaduk had such a high level of attainment for erudition."

"Ha...nothing, nothing. Actually, I know very little. I just happened to know these things and didn't take them much to heart. I believe that most of the things Mr. Stanley could know are not clear about. Mrs. Thumbs up."

"Well, since that's the case... there is an adventurous request. I hope Mr. Rezaduk can serve as Kna's erudition teacher. I wonder what Mr. thinks?"

In fact, Tang Yi had expected that there would be such consequences just now. After she said this, Christina immediately cheered beside her: "Okay, okay, Al, you agree, agree, please, agree..."

Being able to be a teacher in such a noble family must have a generous salary every month, so you don’t have to go out to perform your skills to make money. It’s really easier, but...

"Uh, sorry, I don't think I can agree..." After thinking for a while, he smiled bitterly, "First of all, I have never been a teacher, and the things I have learned are very mixed. If I really want to teach, I don't know where to start; second, second..."

Under the gaze of several people, he said a reason that no one believed it.

"Second, I can't read..."
Chapter completed!