"I wonder if Dr. Li has any questions that he would like to discuss with me?" Lin Xuan asked.
"I got a question a few days ago, and I haven't calculated the result after studying it for several days. I want to ask Master Hou to take a look at it," Li Chunfeng said.
When Lin Xuan heard that it was about solving a problem, he breathed a sigh of relief and said with a smile: "Tell me the problem."
"Today there is a round log buried in the wall. I don't know how big it is. I saw it with a saw. It is one inch deep and one foot long. What is the diameter?" Li Chunfeng said.
Lin Xuan understood the question. It meant: There was a cylindrical piece of wood buried in the wall. I didn’t know its width, so I used a saw (along the cross section) to cut it. When the depth was measured to be one inch, I cut it open.
The width is one foot, what is the diameter of the wood?
This question involves the Pythagorean theorem. Of course Lin Xuan can solve it, but Li Chunfeng cannot understand his problem-solving methods.
"Dr. Li, this question is very difficult. I'm afraid I won't be able to solve it in a short time!" Lin Xuan said apologetically.
He can solve it, but who knows whether Li Chunfeng will ask more difficult questions later.
It is better not to figure it out at the beginning than to be stumped later.
Li Chunfeng felt that his arithmetic skills were not very good, and he would naturally not come here in the future.
"This question is indeed very difficult. It is normal for Mr. Hou to be unable to solve it in a short time. The two of us can discuss it and maybe we can solve this question by combining our efforts!" Li Chunfeng said
.
"Ahem... I think arithmetic is just a trivial matter, and Dr. Li should do something more meaningful!" Lin Xuan said.
At first he thought he could send Li Chunfeng away, but he didn't expect that Li Chunfeng actually wanted to discuss it with him.
"Isn't it meaningful to solve these mathematical problems and then write a book for future generations?" Li Chunfeng said puzzledly.
Lin Xuan was speechless, no wonder you left so many books on arithmetic in history.
"Didn't Dr. Li write to His Majesty in the first year of Zhenguan and put forward 18 opinions on the Wuyin Yuanli? Why not create a new calendar?" Lin Xuan said with a smile.
Li Chunfeng's eyes lit up. Comparatively speaking, calendars are used by everyone. If a new calendar can be rewritten, it will definitely be remembered in history.
"Thank you, Lord Marquis, for your advice!" Li Chunfeng said.
Li Chunfeng no longer had time to think about arithmetic. He chatted with Lin Xuan for a while and said goodbye.
After sending Li Chunfeng away, Lin Xuan breathed a sigh of relief.
Historically, Li Chunfeng proposed the reconstruction of the new calendar after long-term observation and calculation. After Li Zhi succeeded to the throne, Li Chunfeng proposed the reconstruction of the new calendar.
Now that the time is so far ahead, I wonder if he can write it.
But thinking about it, it’s no problem, it’s just a matter of spending more time.
As long as Li Chunfeng doesn't bother him, he can do whatever he wants.
…
After Kong Yingda left the Lin family, the more he thought about it, the more he realized that punctuation marks were very important.
He thought carefully and asked the coachman to divert to the palace.
Li Shimin was reviewing the memorial and was a little confused when he heard Li Mu report that Kong Yingda asked for an audience.
If this old man doesn't teach him well, why come to him?
"Let him come in!" Li Shimin said.
"Your Majesty, sir!" Kong Yingda bowed his hands and saluted.
Li Shimin smiled and said: "Without courtesy, Kong Aiqing came to see me. Is it because the prince is disobedient again?"
Li Chengqian's first teacher was Li Gang, the famous "Prince Killer" in history.
When Li Gang was in the Sui Dynasty, he was the teacher of Prince Yang Yong. After the founding of the Tang Dynasty, he became the teacher of Li Jiancheng.
After Li Shimin succeeded to the throne, he made him Li Chengqian's teacher.
Three emperors in a row chose him to teach the prince, which shows that his ability is very outstanding.
However, Li Gang was unlucky and had a bad fate.
None of the princes he taught sat on the throne.
Li Gang died last year, and Li Shimin asked Kong Yingda to teach Li Chengqian.
Kong Yingda complained to Li Shimin about Li Chengqian many times, and Li Shimin thought he was here to complain again this time.
"Your Majesty, the prince has studied very hard recently and managed the Chang'an Mansion in an orderly manner. He has done nothing wrong!" Kong Yingda said.
"Then why is Kong Aiqing here this time?" Li Shimin asked with some confusion.
Kong Yingda said: "Your Majesty, I came here this time to talk about the sentence segmentation."
"Sentence fragmentation? I wonder what's wrong with sentence fragmentation?" Li Shimin asked doubtfully.
Kong Yingda said: "Your Majesty, today's books are all integrated. Different sentences have different meanings, which will make people misinterpret the meaning of the book!"
Of course Li Shimin knew this, but hasn't it always been like this since ancient times!
"Does Aiqing have a way to solve this matter?" Li Shimin asked.
Kong Yingda said: "I have no solution, but the Marquis of Jingyang County has a solution."
Kong Yingda took out the punctuation marks written by Lin Xuan and explained them to Li Shimin.
"Your Majesty, the presence of punctuation marks will not only facilitate daily reading, but will also be of great help to those from poor families who do not have the guidance of famous teachers. I request that the book be rewritten to include punctuation marks," Kong Yingda said.
Li Shimin also saw the benefits of punctuation marks. With this punctuation mark, reading will become much easier for children from poor families, so that more talents can emerge.
"Kong Aiqing, this is a major matter that benefits the country and the people. I will convene people to help you complete it!" Li Shimin said.
"Thank you, Your Majesty, but this matter requires the cooperation of the Bookmaking Bureau of the Ministry of Rites." Kong Yingda said.
He can add punctuation marks to the book, but he also needs to print the book and disseminate it.
Li Shimin had a headache. If he wanted to add punctuation marks, the previous engraving would naturally not be usable and would have to be re-engraved. (Engraving and printing can only be confirmed to have existed ten years before Zhenguan. It is not certain when it was invented.
Let’s just assume that it’s already there now, so you don’t need to take it seriously.)
The cost of re-engraving all the books will undoubtedly be very high.
Since the increase in commercial taxes and the sale of salt, his financial pressure has eased.
But after all, the business tax and salt had just started not long ago, and there were so many places to use the money, he now had no money at all to re-engrave the engravings.
"Kong Aiqing, you first re-write the book. When your book is finished, I will ask the bookstore to re-engraving it." Li Shimin said.
No matter what, let’s calm down Kong Yingda first.
"On behalf of all the scholars in the world, I would like to thank Your Majesty!"
Seeing that his goal was achieved, Kong Yingda left happily.
Li Shimin rubbed his head and said: "Li Mu, send someone to call Lin Xuan for me!"
…
Not long after Lin Xuan sent Li Chunfeng away, Xu Guangfu came to see him with a happy face.
Xu Guangfu cupped his hands and smiled: "Congratulations, Lord Marquis, on your promotion!"
Lin Xuan waved his hand and said: "I see that you look happy, are you just here to congratulate me?"
"Master Hou, the colored glaze is fired!" Xu Guangfu said excitedly.
"real?"
Lin Xuan was a little surprised. Xu Guangfu said the day before yesterday that there were too many impurities and it would take some time. He didn't expect it to be cured so quickly.
"Thanks to Mr. Hou's suggestion, I asked the workers to increase the temperature and burn it for a longer time, and it actually burned!" Xu Guangfu said with a smile.
"Have you brought the finished product here?" Lin Xuan wanted to see if there was much difference between the glass now and that of later generations.
"Master Hou, it was just a test at the beginning, and the shape of the result was very ugly. I didn't bring him here. I have asked them to burn a new kiln. It won't be long before Master Hou can see it." Xu Guangfu said.
"Come on, take me to see it!" Lin Xuan said.
Burning out the glass not only affects his ability to build a house, but also means that he can make money.
Ever since the construction of the house started, money has been flowing like water every day.
His family's current money may not be enough even if they all spend it.
Now that the glass is out, there will be no shortage of money in the future.
But glass is made from sand and costs nothing at all.
Of course, because of the increase in glass, it will definitely not be worth thousands of gold as before.
But it should be no problem to sell it for a few bucks each.
The Tang Dynasty was saturated, and so were the surrounding countries.
Although Li Shimin took 60%, he only had 40%, which was still a huge fortune.