When Chen Zhou came out of the dormitory, he originally planned to ask Li Li to have dinner with him, but Li Li was too polite and refused to come.

Chen Zhou had no choice but to go downstairs to the next door dormitory alone and wait for Yang Yiyi.

Yang Yiyi lives on the third floor, and the four girls in the dormitory are from four departments of the School of Physics.

I have to say that in the major colleges of the Faculty of Science at Yenching University, there are really very few female students.

Among them, Wuyuan and Shuyuan are the worst.

If there is a comparison between Wuyuan and Shuyuan, Wuyuan is definitely the No. 1 Monk's Academy.

Chen Zhou and his colleagues have two girls in their mathematics department, but Yang Yiyi has only one girl in her physics department.

"Yiyi, your boyfriend is here to see you, so I'll leave first." After Yang Yiyi's roommate finished speaking, he walked to Chen Zhou and whispered, "Your girlfriend is very popular. You

You have to keep an eye on it.”

Chen Zhou glanced at the girl and smiled, indicating that he was not under any pressure.

"Okay..." The girl shrugged, spoke to Yang Yiyi again, and left with her luggage.

Yang Yiyi walked up to Chen Zhou and asked, "What did she tell you?"

Chen Zhou looked at Yang Yiyi and said softly: "Well, let me take a good look at you, you are very important."

Hearing this, Yang Yiyi blushed slightly: "This Li Jing..."

"What's her name?" Chen Zhou asked.

"Li Jing, what's wrong?"

"Ask the brothers in my dormitory."

"Hmm~" Yang Yiyi thought for a while and said, "She is from the astronomy department, and there are only two girls in that department. You have to ask your roommate to hold on tight."

"Well, I'll go back and talk to them."

After Chen Zhou finished speaking, he took Yang Yiyi's hand and walked towards the Yan University Canteen.

It seems to be a course specially designed for the National Day Golden Week holiday. Neither Chen Zhou nor Yang Yiyi has classes in the afternoon.

After the two of them finished eating, they walked around the Yanda campus for a while, and then went to the library.

Although it was a holiday, there were not many people in the library at all.

Chen Zhou and Yang Yiyi finally found two adjacent seats.

Yang Yiyi took out the textbook "Mechanics" (Shu Edition) and handed it to Chen Zhou. Then he took "Mathematical Analysis" (Volume 1) from Chen Zhou and prepared to study on his own.

Chen Zhou looked at her skillful movements, smiled slightly, put "Mechanics" aside, and then took out the "Concise Tutorial on Functions of Complex Variables" (Yanda Edition) textbook.

Yang Yiyi looked at the "Functions of Complex Variables" with some surprise and asked in a low voice: "Chen Zhou, is this the sixth textbook you have read?"

When Chen Zhou and Chen Zhou supervised each other's self-study during the summer vacation, Yang Yiyi had already discovered that Chen Zhou was very fast in reading and self-study, but she didn't expect that Chen Zhou was so fast.

In less than a month, Chen Zhou has taught himself the last two volumes of "Basic Number Theory", "Mathematical Model", "Probability Theory" and "Mathematical Analysis", a total of 5 basic mathematics textbooks.

The key point is that Yang Yiyi feels that apart from the fact that these textbooks all belong to the category of mathematics, there seems to be no connection between them. How did Chen Zhou read them so quickly?

"Well, if you don't count the first book in the course, this is the sixth book." Chen Zhou nodded and opened the "Concise Tutorial on Complex Variable Functions" in front of him.

"That is to say, you have studied all three textbooks for your math class by yourself? Plus those 3 textbooks, there are a total of 6 textbooks. How did you do it?" Hearing Chen Zhou's words, Yang Yiyi was even more surprised.

After thinking for a while, she said again, "Chen Zhou, do you stay up late every day reading instead of sleeping every day?"

Chen Zhou smiled, looked at Yang Yiyi and said, "Are you stupid? Studying also requires a balance between work and rest, how could you not sleep? I mainly studied these books by myself during class time, and you know the rest.

I learned it all by myself when I was studying with you."

After a pause, Chen Zhou whispered: "As for why it's so fast..."

Yang Yiyi: "Why?"

"Of course it's because I'm extremely talented." After Chen Zhou finished speaking, he smiled proudly at Yang Yiyi.

"cough!"

But people around him obviously didn't buy it. The brief conversation between Chen Zhou and Yang Yiyi had already affected him.

This cough instantly silenced Chen Zhou and Yang Yiyi.

Yang Yiyi stopped asking any more questions and just made a decision silently in her heart that she would have to study harder.

Yang Yiyi looked at the book "Mathematical Analysis" (Volume 1) in front of her, and her eyes became focused.

"This girl..." Chen Zhou shook his head slightly, recovered his thoughts, and prepared to read the "Concise Tutorial on Functions of Complex Variables".

This book is the same as the mathematics textbook, written by a teacher from Yan University, and also uses yellow skin.

Complex function refers to a function with complex numbers as independent variables and dependent variables, and its theory is called complex function theory.

As we all know, the concept of complex numbers originated from finding the roots of equations. In finding the roots of quadratic and cubic algebraic equations, the square root of a negative number appears.

For a long time, people could not understand this situation. It was not until later, with the research of Euler, the master of mathematics, and D'Alembert, another great master, that the subject of complex variable functions was founded.

Complex functions are also related to many famous mathematicians in history, such as Cauchy and Riemann, who both made certain contributions to the development of complex functions.

The most impressive time for complex functions was in the 19th century. Just as the direct extension of calculus dominated mathematics in the 18th century, the new branch of complex functions dominated mathematics in the 19th century.

Mathematicians at that time recognized complex variable functions as the most fertile branch of mathematics and called it the mathematical enjoyment of this century. Others praised it as one of the most harmonious theories in abstract science.

Chen Zhou looked at the development history of complex variable functions and felt a little emotional. The development of every era always needs someone to stand up and lead.

Returning to the book "A Concise Tutorial on Functions of Complex Variables", Chen Zhou first read the table of contents, which was divided into eight chapters, including complex numbers and complex functions, analytic functions, Cauchy theorem and Cauchy formula, Laurent series, residues,

Harmonic functions, analytic development and conformal mapping.

Contents such as complex numbers and Pluto series were familiar to Chen Zhou, but things like Cauchy's theorem and formulas were also seen by Chen Zhou for the first time.

After thinking for a moment, Chen Zhou made up his mind to study this textbook on complex variable functions within three days.

On the one hand, the wrong question set will be upgraded soon.

On the one hand, it is to gain mission experience quickly.

Chen Zhou took a sip of the psychoactive potion in the cup and began his book-reading journey.

"Chapter 1, Complex Numbers and Complex Functions"

"1.1 Complex Number Domain"

This section mainly starts with the definition of complex numbers and introduces some basic properties of complex numbers.

Chen Zhou quickly memorized the contents of the book and did not choose to skip it.

This is his consistent habit. For knowledge points that he is already familiar with, reading it again will not waste much time and can deepen his memory.

"Imaginary root i...complex number...real part...imaginary part...imaginary number..."

"Field of complex numbers...complex plane...complex vectors..."

"Conjugate complex numbers..."

"1.2 Topology of the complex plane..."
Chapter completed!