"You're here to become my disciple, right?"
Zhang Cang's lifespan, which he had finally extended by breaking through to Half-Saint, felt like it was about to be shortened again, and he almost spurted out a mouthful of blood.
The Dali Saint who watched this scene in an unknown place almost spit out the tea in his mouth.
As for Mo Cen who was present, he was directly frightened by this scene. His brain shut down and he didn't understand how Xu Kai dared to say such a thing.
Xu Kai felt strange about the silent scene, wasn't he?
Saint Dali wiped the tea from the corner of his mouth, his face kept twitching. Saint Wei Li, who originally monitored the world, now focused a lot of energy on watching this side to ensure that he could take action at any time.
He was afraid that Xu Kai would be accidentally shot to death by Zhang Cang.
Fortunately, Zhang Cang had been a prime minister and had great magnanimity. He only coughed twice before regaining his composure and said, "No. What I want to ask is, are you willing to accept me as your teacher?"
He said it extremely solemnly and seriously. It can be seen that Zhang Cang did not just accept any student and let it go, but treated him as a nephew and taught him everything he had.
Mo Cen finally came to his senses and looked at Xu Kai with eyes full of envy. Recruiting a disciple as a semi-saint is a rare opportunity.
"Oh, that's it, I'm not interested. Say goodbye." Xu Kai cupped his hands and left directly.
Mo Cen was dumbfounded, and so was Zhang Cang.
The two looked at each other, at a loss.
…
…
Xu Kai returned to his small courtyard, and at this time Huang Tu also came back from digging the soil.
Huang Tu threw the shovel away angrily: "We are not allowed to dig soil today in Tianxiang. If we want to dig soil, we have to go to other mountains to dig. It's very tiring!"
After saying that, he turned to Xu Kai and asked, "Why did you go?"
"I went to the Mo family department for a tour." Xu Kai replied, "Which department are you planning to go to tomorrow?"
"Confucian department." Huang Tu said as he carried the big box into his room. "Mr. Wang is in that department, and he has an acquaintance who can take care of him."
When Huang Tu carried the box full of loess in, he came out and asked, "Have you seen the new half-saint today? Do you know who it is?"
"It's Mr. Zhang Cang."
Huang Tu was shocked: "That old gentleman finally became a saint? It's really rare. It seems that no one will say that you are on a dead end."
Xu Kaixin said, who would say that mine is a dead end? He almost became my disciple.
A light cough suddenly sounded. The two of them looked back, and Xu Kaixin asked why he was still catching up. Huang Tuze was shocked and quickly saluted and said respectfully: "I have seen Zhang Sheng."
Zhang Cang nodded and said to Xu Kai, "Why don't you want me to be your teacher?"
Huang Tu was even more shocked. Xu Kai was actually asked by the Half-Saint to accept him as a disciple? What's even more surprising is that Xu Kai actually refused?
Huang Tu felt that there would be no better teacher for Xu Kai. Who else on this road can compare to Zhang Cang, who is already a semi-saint?
He suddenly remembered what Xu Kai said on the way.
“Their path is not exactly the same as mine, and they have nothing to teach me.”
Zhang Cang was a little anxious. Xu Kai is the most talented person he has ever met in his long career. The content of the arithmetic book written by Xu Kai is very basic, but the ideas are very different. It was the way he wrote this arithmetic book that inspired him greatly, so he was particularly grateful for his talent.
Such a rough jade, as long as it is slightly decorated, its future achievements will never be inferior to his.
Xu Kai scratched his head. It was already quite rude for him to refuse Zhang Cang. Do you want to directly say that you are not as good as me? I was afraid that I would be slapped to death by the other party.
"Have you already become a disciple?" Zhang Cang frowned. This was the only reason he could think of for Xu Kai to reject him. Otherwise, he couldn't imagine why Xu Kai, who came from a humble family, rejected a semi-saint disciple.
Xu Kai shook his head.
Zhang Cang's frown deepened and he said sharply: "Then why don't you want me to be your teacher?"
For Zhang Cang, it's not that he can't accept being rejected, but the other party must at least come up with a justifiable reason, and he won't make it difficult for the other party. But Xu Kai rejected him without any reason. To put it more seriously, it was contempt for him, and it might even involve insulting the semi-saint.
Xu Kai suddenly had a flash of inspiration and saluted Zhang Cang and said: "It's not that the student doesn't want to become a disciple. It's just that the student has been thinking about a problem recently. I am troubled by this problem and can't solve it. If Zhang Sheng can help the student solve his doubts, the student is willing to worship Zhang Sheng." As a teacher, I will respect my teacher throughout my life!”
Zhang Cang nodded with satisfaction. His achievements in mathematics were already extremely high, and now he was a semi-saint. He didn't believe there were any problems in the world that he couldn't solve.
"Sir, I have discovered a number that is only divisible by itself and 1. I call this number a prime number."
Zhang Cang nodded, he had discovered this kind of number before. It just doesn't have any practical meaning, so I didn't name it.
"I found that any integer greater than two can be written as the sum of three prime numbers. I have tried many times and found that this is true for every number, but I am not sure about it. If Zhang Sheng, you can prove this proposition, I would like to I worship you as my teacher, and I will be loyal and filial to you. If I disobey you, I will be punished by heaven and earth!"
Xu Kai is talking about the original proposition of Goldbach's conjecture. When Goldbach proposed this conjecture, 1 was also considered a prime number. Now Xu Kai did not say that a prime number is a number greater than 1, so he followed Goldbach's statement when he proposed this conjecture.
This conjecture was not proven until his death in his previous life. Mathematics at that time had developed to an extremely high level, and at best it could only prove the "weak Goldbach conjecture".
He believed that Zhang Cang, who was still at the elementary mathematics stage, would never be able to solve this conjecture. And if it is solved, it means that Zhang Cang of Tianyan Continent has surpassed the top mathematicians in his previous life. What's the harm in worshiping him as his teacher at that time? It would be better to say that he made a lot of money.
Zhang Cang frowned deeply and asked in confusion: "What is the purpose of this proposition?"
Whether it is "Sushu Jing" or "Song and Yuan Shu", they were all created to solve practical problems. Zhang Cang did not understand this kind of abstract mathematics.
Xu Kai replied seriously: "Sir, the "Elements of Geometry" I wrote is also full of propositions that have no specific effect."
Zhang Cang was stunned for a moment, then laughed loudly: "That's true. It seems that I should change my mind in the future. When I go back and consolidate the foundation of sanctification, I will solve this problem of yours."
Apparently, he didn't think it was a problem.
Xu Kai silently thought that this crown jewel of mathematics was not so easy to pick. I hope Zhang Sheng won't fall into inner demons again just because of Goldbach's conjecture just after breaking through to the semi-sage level.
