Jiang Shuiyuan hurriedly sat upright when he heard the sound. At the same time, he looked at the door and saw a young man walking into the classroom gracefully.

Yes, "elegant and elegant". Before this, Jiang Shuiyuan always thought that teachers at Jingshi University were either as arrogant as Mr. Ge, not care about the details, or as gentle as Hui Chengze. Yue Zhiyuan was so gentle. He never thought that anyone would be so elegant. He only saw his facial features, wearing a pair of gold-strapped glasses, and his hair was combed in a straight manner. The straight cashmere coat set off his slender figure, and the dark gray Scottish scarf was hanging casually around his neck. The navy blue trousers were straight, and the leather shoes on his feet were also radiant. The whole person looked delicate and chic, and he showed agility and fashion in the quiet. If he hadn't appeared in the classroom, Jiang Shuiyuan would think he was a fashion model.

He stood on the podium, looked around and introduced himself with a smile: "Hello everyone, my name is Han Tingsong, and I am a lecturer in our mathematics department. According to the arrangements in the department, I will teach you the course "Numerical Methods of Partial Differential Equations" this semester. In fact, it cannot be called a lecture, because my understanding of partial differential equations is very limited. Let us all learn together and make progress together! If you have any wrong words, please point them out directly."

The audience was very quiet.

Han Tingsong did not talk nonsense and began to directly enter the topic: "Before this, everyone should have been more or less exposed to partial differential equations and knew that partial differential equations are an important branch of the mathematics discipline. They are widely related to other mathematical branches and are widely used in natural sciences and engineering technology, such as physics, geology, numerical weather forecasting, large dam stress analysis, nuclear tests, aircraft design and even war decisions. In fact, partial differential equations, as a branch of mathematics, appeared in the 18th century. The first systematic study was the three basic mathematical physical equations, such as wave equations, heat conduction equations, and harmonization equations. The main tool used was classical analysis. In the next two centuries of research and exploration, people have achieved many important results in the theory and application of partial differential equations, and have established a variety of methods to solve definite problems..."

Han Tingsong did not take the textbook, but he talked about it with a piece of chalk, but he made the summary and was not annoying. In just one lesson, he sorted out the important basic concepts about partial differential equations and introduced the Fourier transform and complex matrix, which benefited the river water source a lot.

During the break, Wang Canlong took out a plastic water cup and sipped a few more mouthfuls, then asked Jiang Shuiyuan, "Brother, do you understand?"

Jiang Shuiyuan smiled: "It's okay, after all, it's all an introduction to the introduction and knowledge preparation. It's not too difficult. I guess if it's difficult, I won't understand it."

Wang Canlong seemed very satisfied with Jiang Shuiyuan's answer, and said in a teaching tone of a man: "Knowing what you know, but not knowing what you don't know is knowing! Although Teacher Han is speaking slowly and speaking lightly now, it is because at the beginning of the course, you have to give everyone a process of getting started and adapting. Later, you will find that he is going to drive a fast train, and the content he is talking about is not limited to textbooks. Teachers at Jingshi University are like this. Their class is enough for other colleges to attend three or four classes. So you must take notes carefully during class, and you must review and preview carefully when you go back, otherwise you will not understand it at all after three or four classes!"

Jiang Shuiyuan looked humbly and was taught: "Thank you for your advice!"

"It's not worthy of advice, it's just a little bit of experience."

Jiang Shuiyuan was a little curious: "I listened to my brother's tone. I should have been listening to Jingshi University for a long time, right? And I have been able to try to solve the four-color problem alone, and my academic literacy is even more unspeakable. Why do I still have to listen to such a basic course?"

Wang Canlong's mouth twitched slightly, and after a long time, he replied: "First, the course "Numerical Methods of Partial Differential Equations" is not basic. In fact, many local colleges and universities do not even offer classes on Partial Differential Equations. Secondly, Teacher Han is a Ph.D. from Princeton after all, he is exposed to the forefront of the subject. The content he teaches is not limited to textbooks. Many new ideas and new ideas will make people's vision open. This is also the characteristic that distinguishes Jingshi University from other schools. Also, do you think so many auditors come for the sake of auditors?"

"What about that?"

Wang Canlong said in a lectern: "You see it yourself!"

Jiang Shuiyuan then found that many people were surrounded by Han Tingsong. Some were close to each other, some asked questions, some submitted their papers or books to him for advice, and some even gave local specialties directly, which made Han Tingsong unconscious. Jiang Shuiyuan was also stunned when he saw such a Western scenery: "What are they?"

"Many people listen to it just means, and selling themselves is the goal." Wang Canlong's expression was very complicated, with envy in contempt, and a little contempt in his envy, as if he saw a little girl next door earning money to buy a luxury car and mansion. He couldn't help but raise the plastic water cup and "gudong" and "gudong" to drink a few mouthfuls of cold mouthfuls: "Do you understand selling yourself? Some want to take the postgraduate entrance examination, some want to win awards, some want to publish papers, some want to evaluate professional titles, some want to seek project funding, and some want to come to Jingshi University for gilding... In short, there are all kinds of reasons, and every Jingshi University teacher is a scarce resource, and it is worth striving for it. Therefore, universities are not ivory towers, and the academic world is also a world of martial arts!"

Jiang Shuiyuan is not as cynical as Wang Canlong, and he can only sigh and say, "No wonder everyone says that university is a small society."

"What does 'university is a small society'? University is a society! If you don't believe it, wait for students to evaluate scholarships, teachers to evaluate awards, and professional titles to see. One by one, one can make a dog's brain." Wang Canlong said angrily, "That is, Jingshi University is a little more transcendent, so when I prove the four-color problem, I will come to Jingshi University as a teacher!"

Jiang Shuiyuan once again sent his blessings: "I hope your dreams come true as soon as possible!"

As expected by Wang Canlong, Han Tingsong began to race wildly in the next class. Not only did he finish the basic concept of the finite difference method at the speed of the strong wind sweeping the fallen leaves, but he also interspersed with the development and application of the finite difference method. Before the class was over, he casually listed a lot of reference books, such as "Introduction to Modern Partial Differential Equations", "Numerical Solutions of Partial Differential Equations", "Numerical Solutions of Partial Differential Equations", "Boundary Value Problems of Partial Differential Equations", and so on. Then he clapped the chalk gray on his hand: "There are all these books in the library, and you can go and read them when you have time. As for homework, I won't assign them. Anyway, there are exercises at the end of each chapter of the textbook. You can do whatever you want. Anyway, it's very simple, so it won't delay your and me precious time. The get out of class is over!"

Just after class was over, another group of people surrounded him.

Wang Canlong looked at Jiang Shuiyuan with a smile: "Brother, do you understand this time?"
Chapter completed!