The Science Fiction World of Xueba

After an unknown amount of time, Pang Xuelin opened his eyes in a daze, and the first thing he saw was a snow-white ceiling.

The moonlight shines through the window. Compared with the softer artificial light source in the dungeon, the natural light and darkness in front of him made Pang Xuelin a little unaccustomed to it, but he felt a sense of intimacy for no reason.

Pang Xuelin turned over and picked up the time on the bedside table, which showed November 6, 2019 at 19:30 pm.

Pang Xuelin remembered that he entered the world of Wandering Earth at 00:00 on November 5, 2019. He had spent 22 years in the world of Wandering Earth, but only 19 hours had passed in the real world.

A flash in the pan, vicissitudes.

Pang Xuelin has never felt that time is such a terrifying existence.

Thinking of Yao Bingxia, Pang Xuelin's heart was still throbbing.

Although he knew that once he returned to the real world, sooner or later he would still part with Yao Bingxia, but at this moment, he still found it hard to accept.

"From now on, in the plane world, we must never fall in love again!"

After a while, Pang Xuelin felt his stomach rumbling.

Although the system once said that after entering the plane world for adventure, it can reduce the body's metabolism and ensure the supply of nutrition.

But the food in the stomach will still be digested, and you will still be hungry when you should be hungry.

Pang Xuelin picked up his phone, changed his clothes, and went out to find something to eat.

Tonight is a rare full moon night, the bright moon hangs high in the sky, the night wind blows the fallen leaves all over the ground rustling, it is late autumn, and there is a chill in the air, but Pang Xuelin feels a kind of Unprecedented intimacy.

Thinking back to the world of the Wandering Earth that has long been changed beyond recognition, the peaceful and peaceful world in front of you is the real golden age!

Pang Xuelin stood at the entrance of the corridor, closed his eyes and enjoyed the beauty of the real world for a while, when someone tapped his shoulder suddenly, and a crisp voice suddenly interrupted his thinking.

"Student, what are you doing standing here?"

Pang Xuelin opened his eyes, and what he saw was a beautiful girl with exquisite face and well-proportioned figure, and her tone seemed to be very familiar to him.

Pang Xuelin frowned. There seemed to be such a person in his memory, but he had been in the world of wandering earth for more than 20 years. He had forgotten many characters in reality, and he couldn't remember the girl's name for a long time.

"Oh, it's okay, I'm going out for dinner, let's go first!"

Pang Xuelin forced a smile, and walked past Qi Xin without saying a word.

"Hey, what's wrong with this guy?"

Qi Xin turned around and looked at Pang Xuelin's back with some doubts, always feeling that Pang Xuelin was behaving strangely.

When he came to the restaurant, Pang Xuelin was almost dazzled by the variety of food. The whole world of Wandering Earth was in a state of shortage of supplies. Even with Pang Xuelin's status, he couldn't eat whatever he wanted.

Returning to the real world is almost like returning to heaven.

Pang Xuelin took all kinds of fruits, vegetables and meat for two people, and it took half an hour to fill his stomach.

After eating, Pang Xuelin took a walk on campus for a while.

Along the way, from time to time, you can see young students fighting, couples whispering in corners, night runners striding forward, old professors taking a leisurely walk... Life is comfortable and comfortable.

Pang Xuelin secretly sighed in his heart, what a wonderful era!

After wandering around the campus for more than an hour, Pang Xuelin slowly sorted out his memories in the real world, familiarized himself with Jiangda's campus, and then returned to his residence.

Afterwards, Pang Xuelin took out his mobile phone and first called his grandparents and parents. To them, Pang Xuelin hadn't seen him for a few days, but to Pang Xuelin, he had been for more than 20 years.

I haven't seen my relatives.

Then, Pang Xuelin began to look for some people he had no memory of in the phone address book.

He has not been back to China for a long time, and there are not many people in the address book, but Pang Xuelin saw many familiar names.

People like Qiu Chengtong, Tao Zhexuan, Deligne, and Faltings will not forget Pang Xuelin. These people were added to the address book after the BSD conjecture report.

Liu Tingbo also had the impression that he seemed to be the dean of Jiang Da Mathematics Institute.

But who is this Qi Xin?

Pang Xuelin was taken aback for a moment, and the figure of the beautiful girl whom he had seen downstairs suddenly appeared in his mind.

After pondering for a moment, he dug out WeChat, opened Moments, and found Qi Xin's selfie in it.

Then Pang Xuelin entered Qi Xin's circle of friends based on this account, and accidentally found a photo of himself and her in it.

In the photo, Qi Xin stood in front of him, posing a cute scissors hand, while she stood behind, smiling awkwardly.

The accompanying text is: On the first day back to school, I ran into the legendary academic god Professor Pang Xuelin. I am in a tragedy.

The dusty memories were slowly awakened, and all kinds of things about Qi Xin resurfaced in Pang Xuelin's mind.

"My relationship with her seems a bit ambiguous, but I haven't pierced the last layer of window paper..."

There was a touch of nostalgia and sadness on Pang Xuelin's face.

After going through the sad relationship with Yao Bingxia in the world of Wandering Earth, Pang Xuelin had no idea of ​​falling in love in a short period of time.

"Then how should we get along with her?"

"Forget it, don't think so much, let's take one step at a time!"

...

Pang Xuelin shook his head, put down his phone, and began to think about the next work plan.

Now, only by devoting himself to work wholeheartedly can he suppress the guilt and pain in his heart towards Yao Bingxia.

In the world of Wandering Earth, I have completed the construction of the theoretical system of Ponzi geometry, and using this theory, I have given the general solution of nonlinear partial differential equations in a general sense.

The exact solution of the nonlinear partial differential equation is for the numerical solution of this type of equation. The general solution is the form of the solution of the equation obtained by some methods. After the specific initial and boundary value conditions are given, the special solution is obtained.

However, at present, only simple hyperbolic and elliptic equations can obtain such general and special solutions in the mathematical world.

Most nonlinear partial differential equations cannot be solved exactly. Therefore, Ponzi geometry is to nonlinear partial differential equations what group theory was to the solution of equations.

But in the field of number theory, the value of Ponzi geometry has not yet been exploited.

You must know that I came up with Ponzi geometry theory to solve the ABC conjecture. Who would have thought that this theory would play an unexpected role in solving nonlinear partial differential equations in the world of wandering earth.

In these years, I have been working mainly on the scientific committee in the world of Wandering Earth, and I have no time to think about the ABC conjecture.

Now is the time to think about addressing this issue.

Pang Xuelin thought for a moment, pulled out the manuscript paper, and started working again.