I am the cook, but I am Li Er's son-in-law

Of course, reasoning is not enough to solve a case. The basis of solving a case still has to be based on a large amount of investigation and evidence, but mastering this tool is not a good thing.

After the guests were almost gone, Yin Xuan began to teach them reasoning.

Reasoning is a very interesting thing.

But no matter how interesting things are, as long as they are associated with "learning" and "teaching", they will become boring. The essence of "learning" and "teaching" is to dissect a thing and analyze every part of it. The corner parts, and then use tedious and boring training to gradually integrate it into a part of your body.

What is the most important reasoning?
is logic.

And what is the best way to master logical thinking?
is mathematics.

To cultivate the most basic logical thinking, learning mathematics is the most useful way, much faster than simply learning some concepts.

This is something that neither Zhou Xiaosan, the man surnamed He, nor Li Lizhi and Li Shu thought of.

Of course, the direction of key learning is different.

For Zhou Xiaosan and the man surnamed He, when Yin Xuan came up, he started from the assembly and the proposition.

Any subset or empty set is fine. When the concept of intersection and union is mentioned, their brains are a little empty. When the relative complement and absolute complement come out, they stare blankly.

coming!

The shopkeepers began to speak human language again, and stopped speaking human language—they were obviously using Chinese, and they could understand every word, but they couldn't understand every sentence when they were connected together.

The boring and tedious study begins.

Of course, the more boring things are yet to come. When it was getting dark, Yin Xuan finished the class, waved his hand, and assigned them a homework, asking them to collect different soils from different areas in Chang'an, and then compare the differences.

Collect dirt?

They muttered, a little puzzled.

Dirt is dirt, how could dirt be different?

But Yin Xuan dared to speak like that, they hesitated and nodded in response.

In addition to logic, whether it is deductive method or inductive method, there are high requirements for the mastery of information. In fact, the essence of reasoning is to understand more knowledge and learn to exercise them. It is a combination of knowledge and logic. knowledge.

Zhou Xiaosan and the man surnamed He left holding their heads in their hands, walking cautiously, for fear that the newly learned knowledge would be shaken out if the dingling rattles and shakes.

Li Lizhi and Li Shu also left thoughtfully.They performed slightly better, after all, they had some mathematical foundation.

Yin Lulu is the most innocent.

He just came back from school, before he had time to put down his schoolbag, he was caught by his brother to listen to the class, and before he even had time to cry, he was stuffed with knowledge.

The whole person lay numbly on the table.

Painful, too painful.

In the Chang'an County Government, Yang Zuan sent someone to prepare some gifts after finishing his official duties all day.

He doesn't know much about Tongfu Restaurant.

I just heard from Zhou Xiaosan's mouth, and I have a general impression.

Giving a gift is a very particular thing. Whether it is expensive or not is not the most important thing, but whether it can be delivered to a person's heart is the most important thing.

Gold is more expensive than silver, but to a person who likes silver, giving silver is definitely better than giving gold.

According to Zhou Xiaosan, the shopkeeper is a very kind person to his family, so the gift should not only be given to the shopkeeper, but his family must also be considered.

Yin Xuan has a mother.

Wang is a widow, of course she can't send a man, so after thinking twice, Yang Zuan decided to send two bolts of cloth.

Yin Xuan also has two younger sisters.

One is studying in a school, and the other is learning martial arts from a girl.

Their gifts are the best ones to prepare. Yang Zhuan prepared a set of compiled Four Books and Five Classics for Yin Lulu, as well as compilations of sages and philosophers—if you want to buy this whole set of books, you will have to spend at least a hundred guan.

Of course, Yang Zuan didn't buy it himself. In his capacity, if he wants to get these things, he doesn't necessarily need to buy them.

Prepared a good knife for Jiu'er.

Although the Tang Dynasty had arms control, such things as swords, bows and arrows, wooden shields, and short spears were not under control and could be held privately.

Only when it came to Yin Xuan's gift, he had a difficult time, and he was a little unclear about what to give to the shopkeeper.

Sending gold and silver is too vulgar.Giving jade playthings is too perfunctory.

If Tongfu Restaurant didn't have a quota of wine sellers, he could still send a quota of wine sellers there.

I kept thinking it was getting dark.

Yang Zuan finally decided to follow the ancient etiquette and send two pheasants, that is, pheasants, there.

When the presents are ready, it will be early the next morning.

Yang Zuan asked people to bring gifts, and drove straight to Tongfu Restaurant in a carriage.

As soon as I arrived at the entrance of Tongfu Restaurant, I was frightened by the huge crowd. How can there be such a good business selling food in the morning?This is somewhat beyond his imagination.

But Yang Zuan didn't bother rashly.

He came here to give gifts, not to reward others.

Now that the store is so busy, if he interrupts and goes over to give gifts, it will be a feud.

You can take a few more glances.

Yang Zuan gradually realized that something was wrong, straightened his back, and his eyes became sharper.

wait
He raised his hand and rubbed his eyes, the pupils shrank for a while, then enlarged for a while, what did he see?
Isn't the one who ranked first the Daigong Li Jing?

The one following behind Li Jing is Lu Guogong and the left collar general Cheng Yaojin?

There are also a few people scattered in the crowd behind.

Gao Shilian, Minister of the Ministry of Officials, Hou Junji, Minister of the Ministry of War, Duan Lun, Minister of the Ministry of Industry, Duan Zhixuan, General Zuo Xiaowei
He knew all these people.

Compared with him, the rare high-ranking official in the court may not be as tall as the sky, but he is still a remarkable figure.

How could these people appear in front of a restaurant?
Still so obediently queuing up to buy food?
Yang Zuan's expression gradually became serious, and his facial features twisted. As the county magistrate of Chang'an, he didn't know any news here?

Is he the one who came to give gifts, or came to attend the court meeting.

For a while, Yang Zuan was in a trance.

Looking at the gifts on the carriage, I suddenly felt that I had prepared more conservatively. According to this posture, even if I gave a house with three entrances and three exits, it would not be overstepped.

Wait until the food is sold out.

Wei Zheng failed to buy it again, and kicked Cheng Yaojin's ass cursingly, and a group of people laughed and left.

Yang Zuicai got out of the car with the gift in fear, and walked to the door of the restaurant.

The high-speed rail cleaned up the table and didn't take this aspect into consideration.

Yin Xuan saw this carriage parked not far away early in the morning, and when he saw someone walking towards him, he greeted him: "Guest, the food is sold out, please come early tomorrow, don't be so restrained, my food supply is in short supply .”

Yang Zuan squeezed out a smile, and bowed to Yin Xuan: "Student Chang'an County Magistrate Yang Zuan, came here specially to visit the shop today."

The self-proclaimed student was also figured out by Yang Zuan just now.