September was almost here, and in the last two days before school started, Su Qingyun went to the county and found his teacher Chu Xianming.
"Teacher." Su Qingyun placed the award certificate she had received in front of Chu Xianming. She smiled mischievously, "I did it. Fortunately, I have fulfilled my mission."
Chu Xianming looked at the award certificate in front of him and smiled with satisfaction, "Well done, Qingyun."
He expected her to win the first prize in the individual award, which was not a big surprise. However, Chu Xianming was still a little surprised by Su Qingyun's full score.
"I heard that you were the only one who answered the last question of this written test?" Chu Xianming asked her.
"right."
Su Qingyun glanced at the newspaper pressed under the glass plate. On it was the news page about her winning the award. She thought the teacher must have known the answer to the question from it.
"Tell me, what is the question?" Chu Xianming was a little interested.
"Suppose positive integers a and b satisfy ab+1 can divide a2+b2. Prove that (a2+b2)/(ab+1) is a perfect square number." Su Qingyun simply repeated the question.
Chu Xianming quickly wrote it down in his notebook. He frowned and thought for a while before saying, "Veda jumped."
"Yes." Su Qingyun nodded with a smile.
The teacher is worthy of being a teacher. He quickly discovered the key to solving the problem.
Chu Xianming: "It's not easy, but you did a great job."
"Maybe it's because I've done more questions, so my thinking is more active than others." Su Qingyun smiled.
"Don't be so modest." Chu Xianming also smiled. "What about the free speech session later? What topic did you draw?"
Although there were some reports in the newspapers, they were not detailed enough to warrant a headline.
Su Qingyun paused, "It's the Riemann hypothesis."
"Riemann hypothesis?" Chu Xianming was stunned, his expression a little lost for once. "How could it be the Riemann hypothesis?"
How is it possible to expound on such a world-class mathematical conjecture in just 10 minutes? Is the organizing committee crazy?
"All the test questions were randomly drawn. Among so many contestants, only one other contestant and I drew questions about world-class conjectures. He drew the Fermat conjecture, and I drew the Riemann conjecture. Maybe it was just bad luck."
Su Qingyun explained the situation in a few words.
"Never mind, it's also a kind of fate." Chu Xianming said this and suddenly realized something. "In other words, after you drew the Riemann hypothesis, you still got full marks in this part?"
"Well, the review panel was quite interested in my ideas on the Riemann hypothesis, so they gave me a high score."
"What's your idea? Tell me about it." Chu Xianming asked impatiently, his expression somewhat anxious.
"Okay." Su Qingyun nodded and began to explain slowly, "My own understanding of the Riemann hypothesis is actually this..."
There were not many people in the library. Sunlight shone in sporadically through the gaps between the leaves outside the window. The atmosphere in the library was very quiet, with only the low voices of the teacher and the student talking to each other.
After an unknown amount of time, Su Qingyun finally stopped talking. Chu Xianming's expression was a little dazed.
Although what his student said was not very profound, he felt that it was indeed a very novel idea. If he continued to calculate it, no one knew what would happen next.
No wonder the judges gave her full marks. If it were him, he would do the same.
"Have you ever calculated these ideas and thoughts yourself? What I mean is, have you actually written down and calculated the Riemann hypothesis?" Chu Xianming asked very seriously.
Su Qingyun paused, "No."
Actually, yes, but that was her previous life. In this life, she was too busy and had never calculated the Riemann hypothesis herself. If she hadn't drawn this test question at that time, she would have almost forgotten that she had ever wrestled with this world-class mathematical conjecture.
"You can do the math yourself." Chu Xianming encouraged her seriously, "Maybe this really is the way to go."
Su Qingyun smiled and said, "How can it be so simple, teacher?"
“If you don’t do it, you will never know the result. Only by doing it will you know.”
"I understand." Su Qingyun also looked serious and nodded.
In fact, when they were in Country E, that night when they were discussing with the review team, they seriously told Su Qingyun that she should devote herself to studying the Riemann hypothesis after returning to China. As long as she had some results, she could compile them into a paper, and everyone in their review team could help her check and revise it.
"I'll try to do it."
"That's good." Chu Xianming looked at the time. "It's almost time. Let's stop here for today. You can go back early."
"Okay, thank you, teacher."
After thanking him, Su Qingyun walked out of the library and got on the bus home. After arriving in the town, she unlocked her bicycle, but did not go home. Instead, she walked in another direction, which was the direction of the town government staff quarters.
She went to find Ji Yue.
When she arrived at the town government staff quarters, Su Qingyun stopped her bicycle. Just as she was about to go in, she hesitated again. She didn't know whether Uncle Ji and Aunt Ji were at home at this time.
If they were there, she would be disturbing them if she went there, and she would be asked to stay for dinner by the enthusiastic Aunt Ji. If they were not there, it would be even worse. Although she didn't think it was a big deal, if other people in the family compound saw her and Ji Yue staying alone at home, they would inevitably gossip.
Su Qingyun thought about it and stopped a child who was playing outside the family compound.
"Hey, kid."
The dirty little boy, who had rolled around on the ground, blinked his big, bright black eyes and looked at the beautiful older sister who was holding him with a puzzled look. "What's wrong with you?"
Su Qingyun took out two candies from her bag and handed them to her. "Sister will give you some candies. Can you do me a favor?"
She thought that children of this age would agree to anything when they saw candy, but she didn't expect the little boy to look at her warily, "Why are you giving me candy? Are you trying to kidnap me?"
Su Qingyun: "..."
"Do I look like a child kidnapper?" She always suspected others of being kidnappers, and this was the first time Su Qingyun was suspected of this.
"Don't think you're not a kidnapper just because you're pretty." The boy still looked alert. "My mom said that the prettier a girl is, the more likely she is to deceive. I won't fall for your trick!"
Su Qingyun: "..." Is this a compliment to her? Or is it an insult to her?
Are the kids in this government housing compound so vigilant?
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