Xu Guangqi was training troops in Henan before, and reported that he was unwell and wanted to resign. In fact, Xu Guangqi had no physical problems at all. He just lacked funds for training the new army in Henan and could not practice any tricks, which made him fall into the mud. Therefore, Xu Guangqi wanted to withdraw from Henan and return to Tianjin to settle down.

But unexpectedly, the emperor summoned him personally, so Xu Guangqi had to set off to the capital immediately, and his heart was still stirring up. Will the emperor pursue his crime of deceiving the emperor?

At the same time, he thought the emperor was asking about the training of the new army, which made Xu Guangqi scrape his heart and prepare a lot of explanations.

But unexpectedly, when Zhu Youxiao summoned Xu Guangqi in the Yangxin Hall, he seemed to have no memory of the new army training, but asked him about water conservancy and agriculture.

"Your Majesty, I have studied the method of sweet potato planting for many years and have already had a lot of experience." Xu Guangqi reported that Zhu Youxiao was overjoyed. Unexpectedly, Xu Guangqi actually had research on this thing and asked quickly: "How much is the yield of sweet potatoes in the north?"

"If managed properly, the yield per mu is not a problem. If it is planted on sand, the yield will be much higher." Xu Guangqi replied.

Zhu Youxiao calculated that the 1,600 kilograms in the Ming Dynasty were equivalent to about 1,000 kilograms in later generations (600 grams per kilogram in the Ming Dynasty). Such a high yield made Zhu Youxiao happy and continued to ask: "If ordinary farmers plant sweet potatoes in the north, how many kilograms can each acre be produced?"

"As long as you understand some management, the yield per mu is more than 800 kilograms will not be a problem." Xu Guangqi replied.

"Okay." Zhu Youxiao was overjoyed, and the conditions for promoting sweet potatoes were ripe. Zhu Youxiao then asked about water conservancy, which was also a field Xu Guangqi was good at, and said: "Your Majesty, in terms of water conservancy repair, I, the Ming Dynasty, mostly acted with experience and had strong adaptability, and had many wonderful ideas. However, Taixi Water Conservancy uses mathematical calculations, which are more accurate, but the disadvantage is that they are relatively rigid. I have been devoted to studying Taixi mathematics over the years and use mathematical calculations to calculate water conservancy projects."

Zhu Youxiao couldn't help but feel shocked. Xu Guangqi actually studied mathematics! The requirements for mathematics in water conservancy are indeed relatively high. Zhu Youxiao, who was interested, said: "I have some knowledge of the way of mathematics. Why don't you give me some guidance?"

"This...that's the embarrassing me." Xu Guangqi bowed and his face was full of confidence. Speaking of mathematics, China's elite culture did not attach much importance to it. Xu Guangqi has been studying mathematics for many years, so he is naturally very confident in guiding the emperor.

The reason why Chinese elites are not interested in mathematics is mainly because mathematics itself is based on assumptions. For example, no one can say how long a centimeter is, because the length of each centimeter in this world is different, but the error is controlled within a certain range.

Traditional elite culture is based on Taoist academics. The highest pursuit of Taoist academics is the way to become an immortal. Mathematics cannot be used after becoming an immortal, so the elites are not interested in studying this thing.

Elites are not interested in industry or something. So what if they make contributions to industry? After a hundred years, they are not a dead bone. It is better to pursue the path of immortality. If they can become immortals, they can transcend the cycle of reincarnation.

The numerology extended by traditional Taoism is mainly based on the rules of the "Book of Changes" and applied to calculations of heaven, earth, human fortune, etc. For example, the basic languages ​​of later computers 0 and 1 are the rules in the Zhouyi.

There are also many formulas in traditional numerology. Some formulas are extremely complex, but their application fields are different. Shao Yong of the Song Dynasty even calculated the cycle of the heavenly fortune.

China's Taoist scholarship has a more thorough study of the laws of the universe. However, this kind of thing is too advanced, and low-level primary industries cannot use this thing. When the hundreds of schools of thought contend in the Spring and Autumn Period, except for Laozi Li Er, the various schools of thought were all applying the acquired nature of the "Book of Changes". This is also the reason why many crafts in the Spring and Autumn Period cannot be imitated in later generations.

The controversy between the hundreds of schools of thought in the Spring and Autumn Period was finally burned by Qin Shihuang. At the beginning of the Han Dynasty, it governed the country with Taoist academics, and then Confucian academics. Other schools of thought lost their soil for survival, and the trend of the Chinese nation's transformation into a science and technology society was strangled.

Confucianism has made cultural contributions, but its contribution is relatively low in promoting productivity.

Xu Guangqi is a devout Catholic, which means that he has not learned about traditional elite culture yet, otherwise he would not be able to accept this divine monism. However, Xu Guangqi, a talent who is interested in practical technology, is needed by Zhu Youxiao.

A lot of literati who studied elite culture caught a lot of people in the Ming Dynasty. Xu Guangqi, a practical person like a three-legged toad, was hard to find!

As for whether he believes in Catholicism or not, he doesn’t care about so many!

"Put the pen and ink." Zhu Youxiao waved his hand, and Yang Guang quickly took out the pen and ink and stood aside to polish the emperor. Then Zhu Youxiao and Xu Guangqi, the king and his minister, began to discuss the issue of mathematics.

Xu Guangqi learned European mathematics from missionaries at this time. After the Renaissance in the 16th century, Europe had basically completed elementary algebra and trigonometry. Now it has reached the early 17th century, and European geometry has also been relatively complete.

The monarch and his minister discussed the geometry.

The more he discussed the results, the more shocked Xu Guangqi was. He could not have imagined that Zhu Youxiao not only knew Arabic numerals, but also had a deeper understanding of geometry than him. But what made Xu Guangqi confused and couldn't understand why the noun used by the emperor was exactly the same as the Chinese noun terms he translated into "parallel lines", "triangles", "diagonals", "right angles", "acute angles", "blunt angles", "similar angles", "similar angles", "similar angles", "similar angles", "similar" and other Chinese nouns.

These Chinese nouns and terms were repeatedly named by Xu Guangqi. Zhu Youxiao didn't know about this. However, Zhu Youxiao was a monk before traveling through time! He could play with advanced mathematics, but Xu Guangqi still learned the elementary mathematics in Europe at this time, so naturally it was not above the same level.

"What I learned from the emperor is like the fire of a firefly, and I dare not be as bright as the sun and the moon." Xu Guangqi was really shocked by Zhu Youzhao's math level and bowed in conscience. Zhu Youzhao smiled and said, "You are already doing a good job. I believe that there are not many talents who can understand mathematics better than you are in the Ming Dynasty."

Xu Guangqi immediately suggested: "I think that Your Majesty should write books and teach your advanced mathematics to the people, and there will be talents to use it."

"Your Made a good idea, I'll take the time to write it out!" Zhu Youxiao's eyes lit up. His mathematical knowledge is now a height that crushes Europeans. During this period, the biggest milestone of mathematical progress in Europeans should be the emergence of 'calculus'. In mechanical manufacturing, calculus can be applied. If Zhu Youxiao wants to develop machinery, mathematical knowledge such as calculus must be promoted. Also, Newton's classical mechanics are also the primary system that must be equipped for industrial development.
Chapter completed!