Sitting in front of the window, Zhang Yue held his cheeks and thought about his future.

On the windowsill, a wall calendar carved from bamboo and wood prominently shows today's date: Xia April (26), avoid traveling, get married.

This wall calendar was made by Zhang Yue asked the Tian brothers to make, and then wrote the date himself.

Since there was no paper, bamboo and wood were used instead.

Bamboo and wood are bulky, and they weigh more than a dozen catties in just one month, as thick as a cutting board.

However, this bulky wall calendar, once launched, was very popular.

Not only the scholars who came to Jiating, but also begged for it.

Even the people of Jiating bought a pair and went back.

Can you know the daily days and taboo auspicious things? How strange! Who doesn't like that?

And it's very cheap, just ten dollars for a pair of wall calendars.

The people of Jiating can afford it even if they are poor now!

Because, now there are nearly 200 scholars gathered in Jiating.

Every day for food and lodging, the people of each household can get as much as thirty or fifty dollars!

Today's Kotei has become a holy place for farmhouses.

Young people from far and near gathered in this pavilion.

Whether the family is rich or poor.

Here, their status is equal.

Regardless of political leanings, here, their pursuits are the same.

Zhang Yue used books as bait, and then used some tips and tricks from later generations to firmly attract more than 200 people here.

More than just changed his life.

It also changed the lives of the entire Kotei people.

In just a few days, Zhang Yue's reputation has gone out of Changshui Township, to the entire Nanling County, and even to Baling County, Hu County, Lantian County, and Gyeonggi.

Many people know that there is a Zhang Zizhong in Jiating.

He is generous and knowledgeable.

The most important thing is to be willing to share!

Not only share books, but also share reading tips and methods.

That's amazing!

It's just a template for the sages of ancient times!

And in this day and age, fame is more valuable than gold!

Fame is even more important than official position.

A good reputation, a reputation that can be spread in the local area, it is difficult to make money.

But Zhang Yue now doesn't just want to gain prestige.

Prestige is such a thing, after it is almost brushed, as long as the status quo is maintained, it will gradually increase over time.

But no matter how high the prestige is, he is just a celebrity.

If you die, you can make your life better.

As a traverser, there is a golden thigh of space.

Zhang Yue's ambition is now not only to make himself live well, but also to make his family live well.

He wants to......

Change the world!

If you want to change the world, you must first influence the world.

In this pre-century world, the best way to influence the world is to influence scholars.

As long as the scholars believe, the world will believe.

A vivid example is right in front of Zhang Yue's eyes.

Thirty-six years ago, in the first year of Yuanguang, Dong Zhongshu wrote to the present day, presenting "Raising Virtuous and Good Countermeasures", and put forward the theory of great unification and the induction of heaven and man.

And so, the world changed.

Confucianism is the only one, and Confucianism is dominant.

Even the law has to be interpreted according to the Confucian classics.

However, Confucianism is not achieved overnight.

It's not that he Dong Zhongshu is too awesome, as soon as he reads the book, he has the spirit of the king, the world is subordinate, and the people bow down.

Rather, before the first year of Yuanguang, the long history of more than 70 years.

The sages and giants of Confucianism have overcome all obstacles.

From the ruins, he rebuilt his own system of morality, theory, knowledge and inheritance.

Dong Zhongshu and Hu Wusheng opened mountains in Guangchuan and Linzi to accept apprentices.

Shen Gong and Han Ying preached Confucianism in Chu and Zhao.

Other Confucian scholars, large and small, also contributed to the prosperity of Confucianism.

The scholars of the Chu poetry school have traveled all over the Saiwai, Sanyue and even the southwest Yi.

Before the Han army entered these areas, there were already Confucian scholars who went to the local area to explore.

The Confucian scholars of that era were like the missionaries of the West in later generations.

They do not shy away from hardships and dangers, and they are not afraid of poisonous insects and beasts.

Passing on the torch and working hard, just to spread their thoughts and concepts to more places and let more people know!

In the 70th year of the Han Dynasty, the Confucian scholars developed themselves from a minority to a majority.

By the time of the first year of Yuanguang, at least seven out of ten people in the world were Confucians.

Even if there are three left, they are affected by them.

Under such circumstances, if Confucianism cannot dominate public opinion and hold the right to speak, who can?

Therefore, it is not so much that Dong Zhongshu has changed the world.

It's better to say that Dong Zhongshu stood on top of the trend of the times, all he did was to gently push and open the window.

The successful experience of Confucianism is just around the corner.

Zhang Yue knew that he wanted to realize his ambitions.

Like Confucianism, we have to start from little by little, starting from our feet.

Every time there is one more person, under his influence, the world will change more.

So, what kind of knowledge can change the world?

The answer is...... Mathematics.

As a traveler, Zhang Yue knew that all the technological and scientific progress of later generations was actually based on the progress of mathematics.

From nuclear weapons in the town to a machine, all of them are closely related to mathematics.

The precision of every decimal point means that technology has advanced by leaps and bounds.

At this time, the social environment and public opinion also attached great importance to mathematics.

Among the six arts of Confucianism, there is the existence of mathematics.

In the system of state officials, there are special officials. The prime minister of the Han family, even once called the prime minister!

The deceased celebrities, such as Zhang Tang and Er Kuan, were all great at mathematics.

Er Kuan even participated in the compilation of the Taichu Calendar.

This requires extremely advanced mathematical attainments, and to put it mildly, even college students in later generations may not be able to participate in the compilation of the "Taichu Calendar".

Naturally, it is important to choose what kind of mathematical classics as the starting point.

Among the scriptures sent by Taixue, there is the contemporary immortal mathematical masterpiece "Nine Chapters of Arithmetic".

Zhang Yue has also seen it, and through Jin Yumu, he has firmly solidified it in his memory, and he can recite it backwards with his eyes closed.

Therefore, he can almost figure out the level of mathematics in the Han family today.

It should be around the sixth grade of elementary school in the later generations.

Chapter 9 of Arithmetic has already covered the knowledge and application of multivariate equation solving.

However, the solution of the equations used in the ancient "Nine Chapters of Arithmetic" is very complicated.

It's so complex that it's hard for the average person to read and understand, let alone use.

Only those elites who have been immersed in mathematics for a long time can use it proficiently.

As for the average poor scholar?

Zhang Yue has already seen their embarrassment and shabby in front of this mathematical classic - most people can't even understand the solution of those equations in the nine chapters of arithmetic.

No way, in this era, there are no Arabic numerals, and there are no formulas.

The ancient Chinese mathematicians had no choice but to use their wisdom to describe mathematical problems. And they are so clever that the solution of the equation they use becomes incredibly complicated.

It's so complicated that even Zhang Yue feels quite jerky.

To solve this problem, decipher the reality that mathematics is monopolized by elites.

Zhang Yue knew that he was still uncapable.

Reputation is not enough, strength is not enough.

Even if they come up with Arabic numerals and mathematical formulas from later generations, I'm afraid few people are willing to use them.

So, he needs to brush up on his reputation in mathematics first.

It is best to become a recognized mathematician in the world.

If you become a scholar, you can use the name of a scholar to do things.

Gently knocking on the table, a flash of inspiration flashed in Zhang Yue's mind, he already knew what he should choose to make a breakthrough.

A method that is easy to learn and does not require much talent to master complex and esoteric mathematics even for ordinary people.

Let the poor scholars also talk and laugh about mathematics and calculate quickly.

This method is called the abacus.

The greatest mathematical tool of ancient China.

Before the advent of computers, humans had the best and most convenient calculator.

It's just that when Zhang Yue crossed, the abacus had almost been eliminated by society.

The popularization of computers and the development of the Internet have made it impossible for even professional accountants to need an abacus.

The abacus formula has long since withdrawn from the stage of education.

Disappeared above the textbooks, away from the people.

Fortunately, as a post-80s generation, when Zhang Yue was in elementary school, he was forced by teachers to recite and memorize abacus formulas.

Although, now it's basically forgotten.

However, it can be traced.

There was space for him to regain these forgotten memories.