The peaceful life lasted for three whole days, and Li Yan did not go out for these three days, and has been focusing on compiling mathematics textbooks.

However, Li Yan can't stay up late every day, after all, he is a married person, and he still has to live the corresponding life.

Through these three days of hard work, Li Yan has completed all the mathematics textbooks for the primary school and semi-junior high school levels.

Having compiled so much, it is enough for the time being.

Modern primary and secondary school students have a headache when they learn mathematics, and it is impossible for the Tang people to understand this mathematical knowledge in a short time.

Li Yan doesn't need to worry about the rest of his mathematical knowledge at all, and it is not too late to continue compiling it in a year or two.

However......

"Gone? Is that all? ”

Wang Xiaoxi looked at Li Yan with a blank eye, her learning speed was not as slow as Li Yan's compilation!

Basically, every time Li Yan finishes writing a part, Wang Xiaoxi can thoroughly understand the content of the previous part.

Maybe this is the world of geniuses, Li Yan doesn't have this kind of learning efficiency anyway.

"It's enough for the time being."

Li Yanqiang pretended to be calm, his mental consumption in the past three days was not light.

Mathematics knowledge in the compulsory education stage is not advanced, but according to the memory in the mind, compiling textbooks out of thin air is still quite energy-consuming.

Li Yan had to write those example questions on the spot, and the data had to be made up by himself!

This is also Li Yan, if other traversers whose brains have not evolved, I am afraid that they may not be able to complete a textbook for a year.

"Okay."

Wang Xiaoxi feels very pity, she has enjoyed the feeling of learning knowledge very much these days.

Especially with this knowledge far beyond this era, Wang Xiaoxi even feels that now she can easily solve any arithmetic problems raised by her predecessors, and the whole person is slightly inflated.

Of course, Wang Xiaoxi now knows that Li Yan calls this subject mathematics, and Li Yan always believes that mathematics is the most important thing, even a thousand times more important than the doctrine of the sages.

"Mathematics is the foundation of all things."

Li Yan once said.

"It's time to go out today, let's go to the Tiangong Academy."

Li Yan stood up, stretched, and moved his muscles.

"Good!"

Wang Xiaoxi also instantly became energetic, since Li Yan has no new mathematical knowledge to dig out here, it is not bad to go to Tiangong Academy to play with machinery!

She Wang Xiaoxi is such a genius science and engineering girl! It's not the same kind of person as those vulgar fans who are pretentious and chanting poems and sentences all day long!

In Li Yan's words, she Wang Xiaoxi was born to study the atomic bomb, although Wang Xiaoxi didn't know what the atomic bomb was.

Wang Xiaoxi followed Li Yan to the Tiangong Institute, and as soon as he arrived at the place, Wang Xiaoxi went straight to the steam engine.

"Why is there one more?"

Wang Xiaoxi looked at the middle of the courtyard curiously.

In the current Tiangong Courtyard, there are two steam engines on display, one of which is also connected to a paper machine.

This is the effort of the craftsmen of Tiangongyuan in three days, not only to perfectly reproduce the steam engine, but also to link it with the paper machine, so that the paper machine has truly become a fully automatic machine.

"Good job."

Li Yan praised the work of the Tiangong Institute in the past three days.

Fortunately, he had not been in a hurry to achieve quick success, and had chosen to lay a solid foundation for the craftsmen, otherwise they would not have been able to perfectly reproduce the steam engine in three days.

"Grandpa Guo taught it well!"

Many craftsmen of the Tiangong Academy have long had a good habit of patting sycophants, and they are full of truth, and Li Yan is in a very comfortable mood.

"Fully automatic paper machine, can it run normally?"

"Grandpa Qiyuguo, it has been debugged and can operate normally."

After asking, Li Yan's mood was even better.

The perfect combination of the power machinery of the steam engine and the production machinery of the paper machine means that the era of steam power is about to begin.

The first industrial revolution is about to enter the fast lane, and then only the production machinery of all walks of life needs to come out, and then wait for the economic development of Datang to a certain point, Li Yan's industrial revolution achievement task will also quickly move towards 100%!

"It's time......"

Li Yan muttered to himself.

Li Yanjing turned around and walked into the back room, spread out a piece of high-quality paper produced by the Tiangong Institute, and Li Yan began to draft a notice.

This notice is not a word, and the content is quite straightforward.

The gist of the notice is that the Tiangong Institute will hold an exhibition in a month, inviting businessmen from all over the world to enjoy it, and the Tiangong Institute will also send an invitation to all the nobles and gate valves in Chang'an, inviting them to participate in this grand event.

There is no doubt that the purpose of Li Yan's move is to bring steam-powered machinery into the vision of the Tang people.

This move is similar to the practice of the West in later generations, which is to present industrial machinery in front of everyone in the most intuitive way.

Let the merchants, gate valves, and nobles understand the convenience of mechanical production, so as to set off a large-scale industrialization frenzy.

As the saying goes, all the hustle and bustle in the world is for profit, and all the hustle and bustle in the world is for profit.

Only by showing the convenience of mechanical production and the interests behind it can Li Yan's purpose of promoting the industrialization of Datang be truly realized.

The people of the Heavenly Workshop quickly posted the notice in the most conspicuous position at the gate of the city.

This notice was like a splash of water thrown into the surface of a calm lake, which instantly provoked reactions at all levels and in all directions.

"Steam engines? What is it? Steam? Is it the steamer we usually use to steam steamed buns? ”

"I don't know, what kind of paper machine is there? Qin Guogong said that the price of paper in the future will be cheaper by more than ninety percent? How is this possible! ”

"If the price of paper is really cheap, then wouldn't my doll be able to read?"

The people's reaction to this notice was very average, but they were amazed at the issue of paper prices that were inadvertently mentioned in the notice.

Nothing is more important to the people than their own lives.

The paper price is the only thing mentioned in this notice that is relevant to their daily lives.

As long as the price of paper is reduced, the threshold for poor students to study will be greatly reduced, and the probability of a poor student will be higher.

Compared with ordinary people, those businessmen who have eaten the dividends of textile machines are quite excited about the textile market that is about to be saturated.

As we all know, the machinery sold by Tiangongfang is a remarkable product researched by Tiangongfang.

With the first batch of examples of shrewd small bosses making a fortune, most businessmen in the world have strong expectations for the three words Tiangongyuan.

It's a pity that this time the grand event held by the Tiangong Institute has a threshold, and only businessmen with more than 10,000 fortunes have the opportunity to participate.

All merchants who want to participate must pay a deposit of 1,000 yuan in advance, and the deposit will be returned after the exhibition.

Due to the existence of the margin, many businessmen are directly discouraged by it and do not dare to take risks at all.

In addition to the reaction of the people, the reaction of those nobles and gate valves is even more interesting.

"Tiangongyuan! Qin Guogong! Li Yan! ”

"Ninety percent reduction in paper prices? Mass-producing books? What does Li Yan, the Duke of Qin, want to do? Break the foundation of my family? ”

"This damn Li Yan is not stable when he gets married!"

This is the roar from most of the five surnamed Qiwang families.

They saw a longer term than the people, and they didn't know that they saw the price of paper lower, and they also saw the latter sentence of low-cost mass production of books.

You know, books are the root of the family, and they are the key items to ensure that each family continues to produce talents far and wide.

Li Yan was actually ready to do something about the book, so he was not afraid of public anger.

"We can't stop what the Tiangong Academy wants to do, Li Yan is protected by His Majesty, and Li Yan's reputation among the people has long been no weaker than ours."

"To oppose the Tiangong Academy, it is better to take a look at the so-called grand event."

The family is not stupid, they are very shrewd, knowing that the Tiangong Academy has become a trend, and it will be impossible to stop it.

Moreover, there are examples of the first people who made a fortune by relying on the textile machine, and the people of the family can be regarded as seeing it.

Every time the institute makes a move, it will create a lot of benefits, so that those businessmen with no background in the people will benefit, but it is better for them to end up in person, so they don't believe that with the accumulation of their family generations, they will not be able to compete with those cheap businessmen.

All in all, with the issuance of the announcement of the Tengongyuan, people of all classes took action.

Ideal businessmen quickly scraped together the deposit and went to the Tiangong Institute to pay it, so as not to have too many participants in the future, and they could not get the quota for participation even if they had money.

……

"You have all these drawings, and they must all be made within a month."

In the Tiangong Academy, Li Yan handed over a stack of drawings to many craftsmen.

Most of the machinery on these drawings appeared during the first industrial revolution, but there are also a few drawings drawn by Li Yan himself.

For example, one of the machines called the printing press, which is a simple machine designed by Li Yan alone.

Its structure is also very simple, consisting of blocks, plates, fixed plates, ink ports and other blocks.

This is an upgraded version of movable type printing, and Li Yan directly added the technology of movable type printing to the machine on the spot, making it a serious semi-automatic printing machine.

These are the exhibits that will appear in the exhibition in a month's time, and they will also be an important arrangement for Li Yan to enrich Datang's light industry.

"It's ......"

"Shhh...... It is worthy of the grandfather of the country, what a genius idea! ”

"Semi-automatic ink type printing machine? Won't the price of books in the future be ......?"

The craftsmen of the Tiangong Academy frequently gasped.

Although they have studied for so many days, they already have a general concept of mechanization.

Many people also had the idea of designing machinery on their own, but Li Yan still stunned them by taking out so many complete mechanical design drawings at one time.

These machines cover almost all walks of life, from literati supplies to agricultural tools.

Anyone with a little vision can see that any one of these drawings can cause a lot of sensation to Datang, not to mention that they came out together.

"Can you make it in a month?"

Li Yan is not like listening to the craftsman's sycophants, he just wants to get a definite result.

Compared with the refreshing feeling of being slapped on the back, Li Yan is looking forward to the excitement of getting the "Immortal Cultivation Module" in the future.

"Grandpa Qiyuguo, one month is definitely enough!"

The craftsmen patted their chests to make a guarantee.

They are no longer the newcomers they used to be, and now when they get the drawings, the corresponding steps will appear in their heads.

Less than twenty machines can be made in a month, which is more than enough!

"That's good, I'll be coming to Tiangong Academy every day recently, if there's anything you don't understand, you can ask me."

Li Yan instructed again.

After the instructions, Li Yan called out the ten seeds and started the class.

The preparatory preparations for industrialization have been basically completed, and Li Yan should also focus on the achievement task of basic education.

Li Yan gave a lesson to ten people in the back room, and Wang Xiaoxi was on the side, listening quite seriously, this was Li Yan's class after all, and the content of the lecture was also of great interest to her.

For a time, Tiangongyuan was full of the smell of knowledge.

……

In the palace, Li Shimin's joy at participating in Li Yan's wedding a few days ago has not been able to continue to this day, and he is in a very bad mood now.

As for the reason, it is naturally not because of Li Yan's son, but because of Li Yuan's father.

It is now the second year of Zhenguan, and it is the second anniversary of Li Yuan's seizure of the throne.

In the first year, Li Yuan still had a lot of ambition, thinking of relying on his old subordinates or something to make a Jedi turnaround and kick Li Shimin off the throne again.

However, Li Shimin's methods were ruthless enough, and he was stunned to demote the old ministers of Li Yuan's faction and exile them within two years, and those Li Yuan's people who are still active in the court have long been stripped of their powers, and there is no possibility of jumping at all.

It is precisely because of this that this year's Li Yuan has undergone great changes from the past.

Thinking about Li Yuan at the beginning, when Li Shimin ran to see him, he could still say, "What are the troubles of my son Shimin?" Speaking out makes my father happy. Such words, but now Li Yuan is in a complete self-abandonment.

To sum it up, Li Yuan's spirit has been completely worn out in two years of house arrest.

Therefore, now Li Yuan's life is also happy, working in the Taiji Palace all day long, busy "making" some younger brothers and sisters for Li Shimin.

This made Li Shimin worried.

In just one year this year, Li Yan heard that Li Yuan had several concubines pregnant!

Is this still worth it?

If Li Yuan is allowed to continue to be so pretentious, I am afraid that he will have to "create" a hundred younger brothers and sisters for himself!

At that time, it will be a trivial matter for their daughters to have a bunch of imperial uncles who are younger than themselves or something, but the problem is troubled by the clan system of the Tang Dynasty.

According to the clan system of the Tang royal family, Li Shimin's "younger brothers and sisters" can all be sealed out in the future.

How to arrange this group of future princes and princesses, this is Li Shimin's real headache.

"No! We must not go on like this! ”

Li Shimin slapped his desk hard, he had to come up with a perfect solution to this matter.

At least he must not let Li Yuan continue to be so pretentious, otherwise the Tang Dynasty may become the first dynasty whose territory is not enough to divide the royal heirs, which will definitely be a laughing stock for the ages!

"Do you want to release your father?"

Li Shimin hesitated.

Just when Li Shimin hesitated, Wang De came to report to Li Shimin that the Tiangong Institute would hold an exhibition event.

At this moment, Li Shimin's heart had a plan.