I don’t know how long it took, but Pang Xuelin opened his eyes in a daze. The first thing that caught his eye was a snow-white ceiling.

The windows were filled with moonlight. Compared with the softer artificial light source in the dungeon, the natural light in front of me was a little uncomfortable, but it was a bit unfamiliar with it.

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

Pang Xuelin remembers that he entered the Wandering Earth World at 00:00 on November 5, 2019. He spent 22 years in the Wandering Earth World, but only 19 hours in the Real World.

A flash in the celestial world, changing the world.

Thinking of Yao Bingxia, Pang Xuelin's heart still felt thrust and thrust.

Although he knew that once he returned to the real world, sooner or later he would still be separated from Yao Bingxia in life and death, he still felt a little unacceptable at this moment.

"In the future, in the plane world, you will never fall in love again!"

After being stunned, Pang Xuelin felt his stomach rumbling.

Although the system once said that after entering the plane world, one can reduce the body's metabolism and ensure nutritional supply.

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

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

Tonight is a rare full moon night. The bright moon hangs high in the air. 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 an unprecedented sense of intimacy.

Looking back at the world that has long been unrecognizable on the Wandering Earth, the peaceful and peaceful world in front of me 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. Suddenly, someone patted his shoulders, and a crisp voice suddenly interrupted his thoughts.

"Senior brother, what are you doing here?"

When Pang Xuelin opened his eyes, what caught his eye was a beautiful girl with delicate face and a well-proportioned figure. Moreover, she seemed to be very familiar with herself in her tone.

Pang Xuelin frowned. He seemed to have such a person in his memory, but he had been wandering around the earth for more than 20 years. He had long forgotten many of the characters in reality. He had long been unable to remember what this girl was named.

"Oh, it's okay, I'm going to go out for a meal and leave first!"

Pang Xuelin barely smiled, and then 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 confusion, always feeling that Pang Xuelin was acting strange.

When I arrived at the restaurant, Pang Xuelin was almost dazzled by the dazzling variety of food. The wandering earth world was in short supply as a whole. Even with Pang Xuelin's status, he could not eat whatever he wanted.

Going back to the real world is like returning to heaven.

Pang Xuelin took a whole of two servings of various fruits, vegetables and meat, and it took half an hour to fill his stomach.

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

Along the way, you can see young students playing, couples hiding in the corners whispering, night runners walking forward, old professors taking leisurely walks... Life is comfortable and comfortable.

Pang Xuelin sighed in his heart, it’s such a wonderful era!

After spending more than an hour walking around the campus, Pang Xuelin slowly sorted out his memories in the real world, became familiar with Jiangda's campus, and then returned to his residence.

Afterwards, Pang Xuelin took out his cell phone and first called his grandparents and parents. For them, Pang Xuelin hadn't seen him for only a few days, but for Pang Xuelin, he had not seen his relatives for more than twenty years.

Then, Pang Xuelin began to look for some people he had no impression of in his mobile address book.

He didn't return home for a long time, and there were not many people retained in his address book, but Pang Xuelin saw many familiar names.

Pang Xuelin, a big shot like Qiu Chengtong, Tao Zhexuan, Delinie, and Faltings, will naturally not forget them. These people were all added to the address book after the BSD guess report meeting.

Liu Tingbo also had an impression, as if he was the president of the Jiangda Mathematical Institute.

Yao Bingxia?!

Seeing the name stored in the address book of your mobile phone, Pang Xuelin instantly had the urge to dial it out.

But soon, he suppressed the impulse again.

Yao Bingxia in the real world and Yao Bingxia in the wandering earth are not the same person after all, and they don’t know him at all. I’m afraid that he will only scare her when he suddenly goes to find her.

Pang Xuelin took a deep breath and continued to read the strange names in the address book.

Who is this Qi Xin?

Pang Xuelin was slightly stunned, and suddenly the figure of the beautiful girl he had seen downstairs before suddenly appeared in his mind.

He pondered for a moment, took out WeChat, opened his circle of friends, 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 herself and her.

In the photo, Qi Xin stood in front of him, put on a cute scissors hand, and stood behind him, smiling awkwardly.

The caption is: On the first day of returning to school, I met the legendary scholar Professor Pang Xuelin. Hehe, he was more approachable than I thought. Today, thanks to his help to carry my box of more than 100 kilograms to the eighth floor, otherwise I would have been tragic.

The dusty memories were slowly awakened, and everything about Qi Xin came to Pang Xuelin's mind again.

"I seem to have a bit ambiguous relationship with her, but I haven't broken the last layer of window paper..."

A faint nostalgia and sadness appeared on Pang Xuelin's face.

After experiencing that sad relationship with Yao Bingxia in the world of wandering on Earth, Pang Xuelin had no idea of ​​falling in love in a short period of time.

"Then how should we get along with her next?"

"Forget it, I don't want to think so much, just take one step at a time!"

...

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

Now, only by devoted yourself to work can you suppress the guilt and pain towards Yao Bingxia in your heart.

In the wandering earth world, I completed the construction of the Ponzi geometric theoretical system and used this theory to give a general solution to the system of nonlinear partial differential equations in the general sense.

The exact solution of nonlinear partial differential equations is for the numerical solution of such equations. The general solution is to obtain the form of solutions of the equation using certain methods. After giving specific initial boundary values, a special solution is obtained.

However, at present, only simple hyperbolic and elliptic equations can obtain the general and special solutions in the mathematics community.

Most nonlinear partial differential equation systems cannot be solved accurately. Therefore, Ponzi geometry is like the group theory of the solution to the equations of the equations.

However, in the field of number theory, the value of Ponzi geometry has not been developed.

You should know that I developed the Ponzi geometry theory to solve the ABC conjecture. Who would have thought that this theory unexpectedly played an unexpected role in solving nonlinear partial differential equations in the wandering world of the earth.

In recent years, I have been working on the scientific committees on wandering the earth and have no time to think about the abc conjecture.

Now, it's time to consider solving this problem.

Pang Xuelin thought for a moment, pulled out the manuscript paper, and entered the working state again.
Chapter completed!