Zhaicheng Space Center, in the lounge.

Zhang Zhai sat cross-legged on the ground. The coldness of the ground made Zhang Zhai feel very comfortable. This way of being close to the natural environment kept his mind in a clear state.

"Swish...swish..."

The tip of the pen scratches the white manuscript paper, constantly making black writing occupy the blank manuscript paper.

One page...two pages...

The manuscript paper was filled with various formulas. Zhang Zhai did not copy the proof process of his predecessors, but followed the core ideas and tried to crack it from scratch.

The lounge was so quiet that there was no human voice or any other noise.

This kind of environment can make people feel an uncontrollable sense of loneliness, but Zhang Zhai, who is completely immersed in the proof of Goldbach's conjecture at this moment, cannot feel it at all.

These symbols that look like heavenly books to outsiders, in Zhang Zhai's eyes, are the universe containing infinite mysteries. This boring process is also a magnificent epic, no less exciting and shocking than a warrior defeating a giant dragon.

Zhang Zhai's hand never stopped. His brush strokes were very smooth on the paper, and he used the most precise mathematical language to compose the most gorgeous chapter.

The more proof Zhang Zhai gets, the more excited he becomes. Goldbach conjectured that this is not a difficult problem. Even if the proof has not yet reached the most critical step, Zhang Zhai can feel that it is extremely difficult to completely prove this conjecture.

Its depth and vastness make human wisdom feel insignificant. Every time you think you have a glimpse of the whole picture, you realize that it is just the tip of the iceberg.

However, it is precisely because of this that Zhang Zhai becomes more and more interested, and the sense of accomplishment in overcoming difficulties is addictive!

Zhang Zhai stared closely at the manuscript paper in his hand, his eyes showing excitement and excitement, and there seemed to be a hint of madness hidden in his eyes.

Zhang Zhai's hand moved very quickly on the paper, and his brain was working at an extremely fast speed to maintain the uninterrupted movements of his hand.

"Wow~"

The manuscript paper filled with formulas was not carefully collected by Zhang Zhai, but was scattered to the sky very casually, and then slowly fell to a corner in the lounge, on the ground, in the corner of the wall, or on the bedside.

A piece of manuscript paper fell from the air, landed gently on Zhang Zhai's head, and actually stopped firmly on Zhang Zhai's head.

Zhang Zhai had no time to think about it, he didn't even stop his hand, he just shook his head and let the manuscript paper above his head fall down again.

"Pull...paddle..."

The sound of the pen tip scratching the paper became the only continuous sound in the lounge.

Different frequencies, fast or slow rhythms, make this subtle sound somewhat pleasant to the ear.

The stack of manuscript paper in Zhang Zhai's hand was getting thinner and thinner, and the gel pen in his right hand had to be replaced several times because it ran out of ink.

Time disappeared as Zhang Zhai continued to advance the steps of proof.

It started at nine o'clock in the morning, gradually reached ten o'clock, then eleven o'clock, and finally... the time came to twelve o'clock noon.

Zhang Zhai, who had been keeping his brain running at high intensity, couldn't hold on any longer, not because his thinking had reached a dead end or his inspiration was exhausted, but... he was hungry.

"GuluGulu...GuluGulu..."

High-intensity brain use consumes a lot of energy. As a result, even if you haven't moved much all morning, you will feel hungry faster than usual.

Zhang Zhai heard his stomach ring for the third time, and the sound became louder each time. He could only helplessly cut off his burst of inspiration, stop writing, and pat his stomach.

"Haste makes waste, and you can't eat hot tofu in a hurry... The most important thing is to prove that it's not that urgent yet." Zhang Zhai said, glancing at the last piece of manuscript paper in his hand, and the meaning of the last step on it.

Translated it is.

“Thus, ‘3+3’ is proved.”

Zhang Zhai has started from scratch to advance the proof of Goldbach's conjecture to the 3+3 step.

It only takes half a day, even for re-verification, this speed is already very fast.

"If I start to prove 1+1... let alone a meal, I will not stop starving for three days." Zhang Zhai smiled at himself, then got up from the ground and patted the dust on his legs.

I glanced around the entire bedroom and saw manuscript papers scattered all over the room.

Zhang Zhai stretched out his foot, swept aside the manuscript paper blocking the way to the door, and then walked out directly.

Opening the door to the lounge, Spider and Wild Wolf were meticulously standing on both sides of the door, standing in military postures.

"Crack!"

Zhang Zhai walked out of the door, closed it behind his back, and walked straight to the canteen.

Spider and Wild Wolf said nothing and followed Zhang Zhai directly.

Zhang Zhai half lowered his head, still thinking about the issue of Goldbach's conjecture as he walked.

"I originally wanted to start the proof from scratch, reorganize my ideas, and look for inspiration that can crack the last step of the 1+1 proof, but... until now, I don't have a clue..."

Zhang Zhai thought silently and kept shaking his head.

…

Zhang Zhai walked at a steady speed and soon reached the elevator at the end of the corridor.

The elevator door was closed tightly, but Zhang Zhai didn't pay attention at all and just bumped into the elevator door.

Fortunately, the spider reacted and rushed over. Before Zhang Zhai hit the elevator door, he opened the elevator door, allowing Zhang Zhai to enter the elevator smoothly.

"Mr. Zhang, which floor should we go to?" Spider asked.

"Whatever." Zhang Zhai said casually, still thinking about the 1+1 issue over and over in his mind.

"This step is completely different from the previous proofs of 9+9 and the rules that can be used to prove 3+3. This step is completely different from the previous proof steps.

Arguably... more difficult than all the previous steps forward combined.

Moreover, this step is also the most important and critical step to prove Goldbach's conjecture."

Zhang Zhai half lowered his head, thinking silently.

But Spider standing aside was stunned when he heard Zhang Zhai's words.

"Ah? Mr. Zhang? Whatever?"

Whatever? Which floor are you going to? Dozens of floors underground, dozens of floors above ground, where are you going?

Zhang Zhai reacted when he heard Spider's surprised voice, so he added: "Go to the cafeteria."

"Okay, Mr. Zhang." Spider understood and pressed the button on the 15th floor.

Zhang Zhai was deep in thought, and the other two people didn't talk much.

As a result, the elevator became very quiet, except for the subtle breathing of a few people.

…

The elevator soon stopped at the canteen on the 15th floor. Zhang Zhai was thinking in his mind as he subconsciously opened his legs and walked towards the window.

"Mr. Zhang, what do you need to eat?" Seeing it was Zhang Zhai, the canteen staff asked respectfully.

Zhang Zhai was obviously absent-minded, his eyes were unfocused. When he heard the voice, he said as if he was automatically replying: "Whatever"

"Ah?" The cafeteria chef was confused for a moment, whatever it meant.

Just when he was about to ask again, Zhang Zhai had already turned around and walked to the table in the cafeteria and sat down.

Fortunately, by now the spider had realized what was going on.

"Mr. Zhang must be thinking about some scientific problem again. Maybe he is a genius scientist. He is always thinking about world-wide problems and immersed in the ocean of truth." Spider looked at Zhang Zhai with envy in his eyes.

He turned back to the chef and said, "Just eat what Mr. Zhang usually eats."

"That's it, I understand. Wait a moment and it will be served right away." The chef shook his head and prepared to go.

At this moment, Zhang Zhai was sitting at the dining table, his eyes still blank, but he was thinking intensely in his mind.

"The previous sieving method is definitely ineffective for 1+1. Either we should further improve the sieving method like the old man Chen Jingrun did, or we should abandon the sieving method and create a new mathematical tool or discover a new mathematical theory.

, to solve this problem.

If you want to improve the screening method, where should you start..."
Chapter completed!