When I woke up, it was like a world away.

Li Zhen lay on the sand and took a deep breath of air, a little excited.

I met a year ago, and when I got to know each other, I don't know if it counts as love.

But it always feels short-lived. I will always miss her. But I can't always remember what her last name is.

She taught Li Zhen too much knowledge, and in order to teach Li Zhen more knowledge, she went from a poor student to the first ...... in the whole grade

Sixteen-year-old Li Zhen has never been in love, he is addicted, he really moves humble feelings. It's the girl in the dream, the girl who lived in the age of heaven in ancient times.

After a year, Li Zhen can't even tell whether the world he lives in is real or not. Because the dream is so realistic, it is like being in this world during the day, but at night, I am in another world......

"Why was it just a dream?"

With a light sigh, his eyes became redder and redder.

But what's your last name? I'll definitely ask next time, I'll write it down, and I'll write it down forever.

————

When I woke up, it was like a world away.

Zhang Zhi sat in the warm bedroom under the air conditioner, on the soft bed, with a long hair combing on his shawl, and a pair of almond eyes full of mist.

The feeling of Yixing is very strong.

Miss him.

In one year, I have changed a lot for him. From a poor student like a gangster, he became the first in the school. For him, thank him too.

Thank you also to him for bringing magnificent waves to his life. I've never looked forward to going to bed at eleven o'clock......

In the dream, it is another life.

"Why was it just a dream...... Is it possible to meet? ”

Zhang Zhi muttered, raised his head, and tears dripped down, falling on the luxurious velvet quilt, printing a cloud of splash.

There was a knock on the door.

"Go to school!"

"Got Dad, I'm getting up."

Zhang Zhi hurriedly wiped away his tears and shook his long hair, adjusting his sad expression.

Brushing his teeth, washing his face, taking the car to school, he has been distracted: But what is your surname?

True...... What really?

I'll definitely ask next time, I'll write it down, I'll write it down.

————

Early in the morning, public high schools started again.

Yesterday day, I mainly talked about history.

Today, however, I mainly talk about mathematics.

For Li Zhen, who has already learned calculus in mathematics, mathematics in public high schools is really at the elementary school level. When the teacher at school was still using formulas and 'fingers' to calculate X, Li Zhen could already mentally calculate all the existing math problems in an instant.

This day is spent on getting money quickly. The college entrance examination will start in more than ten days. That's my top priority, I have to take the test, I have to take the test.

He also analyzed the importance of the college entrance examination during the 10,000-year period of the new calendar.

In this era, imperial power reappeared, and the whole country was completely controlled by a hereditary centralized power. Therefore, the largest resources of society are not dispersed, but centralized, and the majority of interests are in the hands of a few.

And getting into a university that is highly valued by the empire is the only option to get ahead. Only those who become the Empire can be cared for by the Empire. Only when you have mastered most of the benefits can you use these things to spread the knowledge you have mastered more effectively.

Money is the only problem. In the 10,000th year of the new calendar, the problem of corruption is more serious than imagined.

The rich are extremely rich, and the poor are extremely poor. The gap between rich and poor is considerable.

Early in the morning, Li Zhen came out to pick up garbage and pick up waste products with his back on his back.

By noon, a basket full of metal products, waste paper, and plastic products had been harvested. The main thing is that these things can be sold for money.

"Why didn't you go to school today?"

The female boss of the scrapyard laughed.

Li Zhen said: "Today's class is boring, it's better to come out and earn some money." ”

"Hahaha, didn't you threaten to go to the college entrance examination? Impetuous now? ”

"Huh. Neither is it. ”

“……”

Without too much explanation, Li Zhen went to Qiantang Valley with his back on his back.

At noon, I harvested a lot again, but I was already exhausted. He hadn't eaten for a day, and now his hungry chest was pressed against his back, which was really painful.

Under the scorching sun, I almost collapsed, so I found a shady place to rest.

I didn't want to spend money to buy some food, but I just picked up some leftovers from other people's food in the garbage heap, but I could still eat to satisfy my stomach.

'Rustle'

Lying on his side in a cool place, but not sleeping. Instead, he picked up a black tile and wrote and drew on the ground.

A moment later, a large number had already been written on the ground.

Pi!

After this new calendar, the concept has never been put forward again.

Li Zhen has been calculating pi for months, closer to the culture of ancient times than his contemporaries, and Li Zhen knows better than anyone what pi will be used for in the future.

Pi was an unsolved mathematical mystery of their time. I don't want to be able to solve this mystery, but it's extremely useful. ”

"Nowadays, no one can accurately determine the area of a circle, but the area of a circle can be calculated by pi. Astronomers can't figure out the area and size of a planet, whereas pi can be calculated. It can even be used with calculus to derive the trajectory of the planets. ”

"I heard that the professors at Fuxing University wanted to restore the calculator from ancient times. As I said, I want to know if the calculator's calculations are accurate. Pi must be studied. Before entering university, if I calculate the last 10,000 digits of pi, many problems will be solved by then......"

Constantly listing lines of arithmetic formulas on the ground, and constantly writing Arabic numeral symbols on the ground with tiles.

As soon as he calculates pi, he is easily addicted to it, and time passes unconsciously quickly. In the blink of an eye, it was already afternoon.

“3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651……”

I was in a trance, and I kept writing numbers on the ground and calculating them.

The concept that has never been mentioned in this era, Li Zhen is doing mental arithmetic and oral arithmetic.

He had been calculating pi for a few months, and by now, Li Zhen had calculated more than 3,700 decimal places......

What Li Zhen didn't know was that an hour ago, an old man wearing reading glasses stood behind him, looking at Li Zhen who was lying on the ground and calculating.

Li Zhen unknowingly counted here for several hours, but never noticed that there was anyone behind him.

Calculating pi is a hobby now, and it is also paving the way for the future. As soon as he has time, Li Zhen will continue to count backwards.

He was tired of picking up waste, and said that he was lying here to rest, but he couldn't be idle at all.

'Ahem'

The old man's throat itched and coughed, which woke up Li Zhen in an instant.

Li Zhen looked back and exclaimed, "Teacher Wang! ”

This is the math teacher of a public high school, surnamed Wang.

Teacher Wang pushed his reading glasses and said with a smile: "You didn't have class today, and I heard from my classmates that you were picking up garbage in Qiantang Valley, so I came out to look for you." ”

"Huh?"

Li Zhen was a little flattered: "I'm still bothering Mr. Wang, you came to me, this ......"

"It's heartbreaking. I heard that you had a surprising remark in history class yesterday. I'm looking forward to today's class and would like to ask you a few more questions. But you didn't come, so I came out to look for you. Because after hearing about your remarks yesterday, I feel that you are not as simple as I felt before, and I have placed my hopes on your college entrance examination. Unexpectedly, you, like other classmates, gave up ...... in advance"

Li Zhen smiled, really not knowing how to answer. He wondered in his heart, in school, he had always had a very low sense of existence, why did he bother Teacher Wang to find it? Before this, Li Zhen even thought that this Teacher Wang didn't know that there was such a student as himself.

"I didn't give up."

"If you don't give up, why come and pick up trash and not go to class? There are still ten days left before the college entrance examination. ”

"Hehe, nothing."

Teacher Wang glanced at Li Zhen deeply, and changed his words: "What kind of formula did you write this?" At first, I thought you were scribbling, but I also divided the two numbers by each other, and it turned out to be ...... No answer can be derived. How can such a number exist? It seems that it will never be able to get rid of it...... But it's the same as dividing 10 by 3, but it's not the same. Your number turned out to be an irrational number, not a cycle. It's unbelievable, what is this number? ”

“π”

"Huh? What pie? ”

Li Zhen was silent for a while, he was not ready to announce the matter of pi now, smiled and said, "What I found by accident is not enough to mention." ”

Teacher Wang was a little urgent: "Child, you have to tell me, what are these two numbers?" Where did you get it? Why is this happening? After this decimal point, there are thousands of units. Are you all counting these thousands? Oh my God, what kind of math genius are you......"

Li Zhen smiled, didn't speak for a while, and took out a small notebook. After calculating more than 3,000 numbers before, dozens of numbers were written. These dozens of numbers were calculated today. Gotta record it.

Then, in a few months, Li Zhen had already calculated the three thousand eight hundred after pi...... Every day there will be accumulation, and every day there will be progress.

He felt that he would always calculate the 10,000 digits after pi.

After recording the new dozens of numbers obtained today, Li Zhen put the small notebook in his pocket in Teacher Wang's eyes, and said with a smile: "Then I'll go back to class after I deal with these." Teacher Wang, the environment here is not good, you should go back to school first. ”

Teacher Wang pushed his glasses, looked at Li Zhen deeply, turned to leave, and said, "Hurry up and come to school." I have a lot of questions for you. Other teachers also have a lot of questions. There are also some questions and things that the school has to offer. ”

“……”