Wan Hongsheng looked at the black head of the audience, took a few deep breaths, and stayed at home for nearly three months, so that he finally touched the edge of calculus.

According to the summary of Chongzhen and the academicians of the Academy of Sciences, in order to solve the four major categories of problems in physics and mathematics, it is necessary to set up a special discipline to study.

The first is the study of the problem of immediate velocity during movement; The second type is the tangent problem of finding the curve; The third type is the problem of finding the maximum and minimum values of a function. The fourth category is to find the length of the curve, the area enclosed by the curve, the volume enclosed by the surface, the center of gravity of the object, and the gravitational force of a fairly large object acting on another object.

What Wan Hongsheng is talking about today is about finding tangents, finding maximums and minimums, and definite integral methods. He also preliminarily proposed that an equation determined by two unknown quantities corresponds to a trajectory that can depict a straight line or curve.

Although Su Changqing had returned most of his knowledge to the teacher, he also understood that Wan Hongsheng was only one step away from stepping into the door of calculus, and the conclusion he put forward later was the basic principle of analytic geometry.

The content of Wan Hongsheng's speech was too difficult and profound, and most of the people in the audience were confused, and even a few professors who taught mathematics seemed to understand it.

A mathematical theory that no one understands will naturally not be able to receive warm applause like those before him.

Almost everyone was talking to each other, asking each other if anyone understood what the people on stage had just said.

Looking at the strange reaction below, Wan Hongsheng squeezed the manuscript's hand, and began to sweat non-stop, and his nervousness now even exceeded that when he listened to the gold list before.

If the research he publishes today is not recognized by the university, even Wang Dejin will no longer be able to hire him as his assistant.

Wan Hongsheng was feeling a little desperate when suddenly a crisp burst of applause came from his left. He suddenly turned his head to look, and when he saw the people applauding him from the audience, his eyes were about to pop out.

"Your Majesty." He subconsciously shouted, but because he was too nervous, his voice was not loud and a little distorted. The people in the audience didn't hear what he was saying, but people from other directions also looked at Chongzhen.

Many teachers sitting in the front row recognized it, and it was the Ming Emperor himself who stood up and took the lead in applauding. They immediately stopped worrying about whether Wan Hongsheng's theory was correct or not, and they also stood up and applauded.

With these teachers taking the lead, soon the crowd inside and outside the auditorium applauded, and the thunderous applause suddenly drowned out Wan Hongsheng, who wanted to say something on the stage.

When everyone stood up and applauded, Zhu Youzhen, who felt that he had finished listening to the paper he wanted to hear, quietly turned around and left the auditorium.

As he walked out of the auditorium and into the tree-lined path leading to the backyard, Kinney and several other missionaries followed. Zhu Youzhen gave an order to Wang Chengen, and then greeted the Jinnige and a few people with a smile.

Jinnige hurriedly walked a few steps quickly, followed half a body behind Chongzhen, he bowed down, and said with a smile: "If Your Majesty's behavior just now spreads, I'm afraid someone will say that our university is too unruly." ”

Zhu Youzhen smiled and said: "The rule in the university should be that there are only teachers and students in the school, and there is no other identity. ”

"Your Majesty is wonderful, but even between teachers and students, there is still a distinction between an emperor and a subject. As His Majesty the Emperor, you should be respected everywhere. Jinnige did not hesitate to compliment Chongzhen.

"I don't think so, if there is anything worthy of respect in this temple of knowledge, it should be a scholar. Objects that deserve more respect than one scholar are two scholars.

Well, Father Kim. If you have something to say to me, you might as well say it directly, and you don't have to beat around the bush. Zhu Youzhen turned around, smiled and said to Jinnige.

Jinnige smiled rather unnaturally and said, "Your Majesty, Father Deng Yuhan followed a medical team from the medical school to Datong, where it is said that there will be a war with the Tatars.

According to the letter sent back by Father Deng Yuhan, a civil strife was taking place among the Tatars in the steppe, and a large number of Tatars were driven out of their homes.

Although His Majesty graciously accepted them into the Guannai and gave shelter to these poor Tatars. But in addition to material help, they need God's merciful comfort.

Therefore, I beg your Majesty to grant permission for us Jesuits to send a team to Datong to assist Father Deng and to help the Lamb of the Lord who have lost their way. ”

Zhu Youzhen suddenly felt a little embarrassed by Jinnige's request, and he was silent for a moment before saying: "I remember the contributions made by the Jesuit priests to the Ming Dynasty in the past year.

However, it was very difficult for me to ask the Jesuits to send people to Datong to preach to the Mongols. Those Mongol tribes have always believed in Lamaism, and if you rashly proselytize them, arousing the antipathy of these Mongols towards the Ming Dynasty, how do you think I should treat you in the future? ”

Jinnige calmly replied to Chongzhen: "Your Majesty's protection of those lamas is really surprising, but in my opinion, those lamas enjoy the generous provisions given by Your Majesty, but they do not pay enough in return to Your Majesty. Even they did not show their loyalty to Your Majesty. ”

Zhu Youzhen blinked, "Just like this, it's not enough for me to agree to your request." Maybe the lamas didn't show me their loyalty, but at the very least, they didn't incite the believers against the Ming Dynasty, did they? ”

Kinney Pavilion thought for a moment and then said, "I once heard your majesty say a proverb that says: You can't put all your eggs in one basket.

Since those lamas can't make their followers loyal to you, why doesn't Your Majesty find them a competitor?

Isn't it a good thing for you that those Tatars have different beliefs, and that there will never be a unified tribe in the steppe that opposes you? ”

Zhu Youzhen was a little moved, but he quickly shook his head and said: "You advertise to those believers that your love for God is more than everything in the world. Those Mongolians are simple by nature, if they really believe in your teachings, and love God more than they love Daming, today's small benefit will be the biggest evil disease of tomorrow's Daming. ”

Jinnige stopped talking, and turned his head to look behind him. After looking at his strange behavior, Zhu Youzhen waved his hand and asked Wang Chengen to lead the people back more than 20 steps away.

After watching the people behind him withdraw from a long enough distance, it was estimated that he could no longer hear his conversation with the emperor, before turning his head and whispering to Chongzhen.

"Your Majesty, as a person, I am very willing to pledge my allegiance to you, Your Majesty. I also very much agree with the philosophy expounded by the sages of your country, that the Lord should be in charge of the spiritual life of man, not the worldly life.

But I am just a small ordinary priest in the Jesuits, and I cannot influence the missionary policy of the Jesuits, but the real influence of the mission of the Jesuits lies in the Holy See in Rome.

Within our Society of Jesus, there are those who advocate following Father Matteo Ricci's flexible missionary approach. There are also those who advocate that any missionary rite should be the same as that of the Holy See in Europe. ”

"So?"

"In order not to allow these opinionated missionaries to spoil the great situation that Father Matteo Ricci has created in China, I hope that Your Majesty will give them a chance to retreat. In this way, the Jesuit missionary method in Daming can be continued. ”

Zhu Youzhen looked up at the sky, his head was obscured by the canopy of a big tree, looking at the golden light leaking from the gaps in the leaves, and after a long time, he lowered his head and looked at Jinnige and said.

"I can give you this opportunity, but I want you to tell the priests who are going to Datong. They can only carry out their activities in designated places, and if there are threats, deceptions, inducements, or opposition from a large number of herdsmen in the course of their mission, then I will have the priests who went to the mission escorted back to the capital, and in serious cases, they will be expelled from the Ming Dynasty. ”

Without hesitation, Jinnige nodded in agreement, "This is a matter of course, I am willing to assure you." ”

Zhu Youzhen nodded at him, then turned around and continued walking towards the professor's lounge in the back.

After receiving Chongzhen's consent, Jinnige's expression was much happier. The next conversation he had with the emperor was a relatively light topic.

In the professors' lounge, Zhu Youzhen met with these university professors one by one, and then had time to meet Wan Hongsheng, who was brought by Liu Yourong.

After Zhu Youzhen chatted with him for a few words, he realized that this was the one who wanted to study the gyroscope.

Although he regretted not being able to complete the gyroscope, he was not surprised. After a few words of conversation, he turned the topic back to the report made by Wan Hongsheng today.

Zhu Youzhen came to him, mainly to fix mathematical symbols such as calculus, logarithms, and exponents.

Simple and clear mathematical symbols can make it easier for students to learn and make calculations easier for mathematicians. Of course, for him, a soul from later generations, determining these mathematical symbols in advance is mainly to facilitate his future reading of these mathematical manuscripts.

In just over an hour of discussion, Wan Hongsheng benefited a lot, and these mathematical symbols written by Zhu Youzhen are the products of the continuous standardization of many mathematicians over the centuries, and they are also the crystallization of the wisdom of many scholars.

Just from these concise symbols, Wan Hongsheng already felt the interconnection between them.

After communicating the problem of mathematical symbols, Zhu Youzhen asked him about the calculation formula of the lunar trajectory, and Zhu Youzhen hoped that Wan Hongsheng could further study the theory published today, so that he could use it to solve the problem of calculating the lunar trajectory.