The cafeteria of Zhaicheng Space Center is still very quiet at the moment. Although it has already reached lunch time, few of the research madmen at Zhaicheng Space Center come to eat on time.

In a corner of the cafeteria, Zhang Zhai was sitting at the dining table with a bowl of beef noodles in front of him.

Zhang Zhai holds the chopsticks in his right hand, and his movements are very mechanical. He repeats a series of actions of holding the noodles, raising his hand, stuffing the noodles into his mouth, chewing with his teeth, and finally swallowing.

His attention was not on the food in the bowl, let alone the taste of the food. Eating was purely a subconscious act to replenish energy.

"Improved sieving method...Improved sieving method..." Zhang Zhai's eyes were unfocused, and his whole person was immersed in this kind of thinking.

There was only one thought left in his mind, and his brain kept running for it.

I don't know how much time passed after thinking about it, but Zhang Zhai suddenly felt that someone was holding his right hand while he was repeating the action of eating noodles.

"Stop pinching it, the noodles are already gone."

A familiar and old voice sounded in Zhang Zhai's ears, bringing Zhang Zhai, who was deep in thought, back to reality.

"Um?"

Zhang Zhai frowned, lowered his head and took a look. Sure enough, the bowl in front of him was empty except for the noodle soup at the bottom of the bowl.

Zhang Zhai raised his head again and saw Gan Xiaohua sitting in front of Zhang Zhai holding a bowl of noodles.

"Mr. Zhang, what are you thinking about? Are you thinking so absorbedly?" Gan Xiaohua asked casually after taking a bite of noodles.

"Think about some mathematical problems." Zhang Zhai replied with a smile.

"Mathematical problem?" Academician Gan Xiaohua put down his chopsticks, became interested, stared at Zhang Zhai and said: "I'm afraid there are not many mathematical problems that can make you think hard, Mr. Zhang?"

"Let me guess, which one of the seven major mathematical problems is it?"

"Poincaré's conjecture? Although it has been cracked, it uses proof by contradiction. If a direct proof method can be found in topology, it would be very meaningful."

Zhang Zhai shook his head when he heard this, "It's not one of the Millennium Prize problems, it's Goldbach's conjecture."

"Goldbach's conjecture?" Academician Gan Xiaohua was stunned for a moment, then shook his head with a smile and said: "Mr. Zhang, you are really brave. This is a deep pit. Since the Goldbach's conjecture was proposed, there have been two

After more than 170 years, it is still enduring. It can be said that it is an evergreen tree in the history of mathematics. Countless mathematicians rushed up one after another and spent their whole lives trying to prove it, but they all fell into the pit and never got up again.

Especially in the past fifty years, the proof of Goldbach's conjecture has basically been at a standstill without any breakthrough progress."

Gan Xiaohua said at the end with a rather emotional tone and a somewhat sad expression.

"From what you said, Academician Gan, it seems that you have also studied Goldbach's conjecture?" Zhang Zhai asked with a smile.

"Who has never been young and frivolous?" Gan Xiaohua said with a nostalgic look on his face.

"When I was an undergraduate in college, I only studied basic mathematics. At that time, I had just learned some superficial mathematics knowledge and had just entered the world of mathematics. I was a little confused about how high the world was.

I happened to have the opportunity to learn about Goldbach's conjecture, and then, as soon as my brain was excited, I plunged into it. As a result... the more I studied, the more I felt guilty and found that I might not have the talent to study mathematics, so I switched to engineering for my master's degree."

Zhang Zhai smiled when he heard this. He really didn't expect that Academician Gan would have such an experience.

"So let me say, things like mathematics are too illusory. It's okay to use them. If you really study basic mathematics, forget it. If you don't do it well, you will be able to get into it for the rest of your life." Academician Gan shook his head.

"Mr. Zhang, let me advise you. Although Goldbach's conjecture is an evergreen tree that stands tall in the field of mathematics, although it looks very tempting, there is really no need to spend too much time studying it."

"Besides, Mr. Zhang, if you study this kind of mathematical problem, it is better to study nuclear fusion directly. It is about the same difficulty but more meaningful."

"I know, I just thought about it randomly, what if it is cracked?" Zhang Zhai smiled and said lightly.

"It's not that easy. Mathematics depends not only on talent, but also on luck." Academician Gan ate his noodles, shook his head and said, "Mr. Zhang, your IQ is definitely much higher than most humans, but mathematics

When planting things, sometimes he just relies on a flash of inspiration."

"Well, how about we make a bet, Academician Gan?" Zhang Zhai said with a smile.

"What kind of bet are you making? Facing a rich man like you, I have nothing to lose." Academician Gan said.

"I bet on whether I can crack Goldbach's conjecture in a short time. If I lose, Academician Gan, your salary will be doubled. If you lose... I remember that you are at the National Space Center and the Department of Aerospace of Peking University.

There are quite a few students, right... you can recruit two here." Zhang Zhai said with a smile.

Academician Gan Xiaohua, who was eating noodles, stopped eating noodles, looked at Zhang Zhai, paused for two seconds, and then said decisively: "No gambling."

"Mr. Zhang, although my IQ is not as good as yours, I am not a fool. You are obviously very confident. Why should I bet with you in this situation?"

Gan Xiaohua shook his head, "Besides, the salary is pretty good now. I'm so old, so why do I need so much money? I have the mind to do something, but my body doesn't have the ability."

Zhang Zhai stared at Gan Xiaohua, then smiled and shook his head: "If you don't want to bet, don't bet. Just wait and see, Academician Gan, to see if I can solve this century-old problem in three days."

"Then I'll wait and see." Academician Gan started eating his noodles again, "If it really succeeds, then Mr. Zhang will add another world-class mathematician to your long list of titles."

Zhang Zhai looked at Academician Gan Xiaohua eating noodles and felt a little hungry again. He had been thinking about the problem just now. He really didn't feel anything after eating the noodles, and his stomach still felt empty.

"Chef, two more bowls of noodles!"

…

Zhaicheng Space Center.

Zhang Zhai has stayed in the bedroom in the lounge for two days and has not gone out. He always eats in the bedroom.

At this moment, Zhang Zhai was sitting on the cold ground, motionless and thinking hard.

The final draft paper in front of him clearly recorded that 1+2 has been proved, which is Chen Jingrun's theorem (any sufficiently large even number can be expressed as the sum of a prime number and the product of no more than two prime numbers)

.

However, the last step had already blocked Zhang Zhai for a day and a night.

Zhang Zhai didn't take a break all day and night. He just stared at Chen's theorem without moving!

Time is still passing by little by little, Zhang Zhai is like a sculpture, sitting on the ground, frowning.

From morning to noon, from noon to evening...

"Dong dong..."

"Mr. Zhang, your dinner." Spider's voice sounded, but the figure with his back to Spider didn't respond at all.

Spider glanced at the lunch that had already cooled down and was not touched at all. He sighed slightly, shook his head, then put down the dinner, took the lunch away, and walked out of the door cautiously.

"Crack!"

The door closed again, making a small sound.

At this moment, this moment, Zhang Zhai, who had been sitting all day, finally moved!

The frown on his face gradually relaxed, and the corners of his mouth raised slightly, and he smiled.

"I finally waited for this spiritual light. It turns out... it's so simple." Zhang Zhai said in a low voice.
Chapter completed!