Chen Zhou came out of the dormitory and originally planned to call Li Li to eat together, but Li Li was too polite and refused to come.

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

Yang Yiyi lives on the 3rd floor, and the 4 girls in the dormitory are put together by the 4 departments of the Academy.

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

Among them, the Courtyard of Objects and the Courtyard of Mathematics are the most severe.

If the Mononomiast is compared with the Mathematical Academy, the Mononomian is definitely the first monk's academy that deserves to be.

Chen Zhou and their mathematics departments have 2 female students, but Yang Yiyi's physics department has only 1 female student.

"Yiyi, your boyfriend is coming to you, I'll leave first. After Yang Yiyi's roommate finished speaking, he walked up to Chen Zhou and whispered, "Your girlfriend is very popular, you have to take care of it." ”

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

"Okay..."The girl shrugged her shoulders, said hello to Yang Yiyi again, and dragged her luggage away.

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

Chen Zhou looked at Yang Yiyi and said softly: "Well, let me be optimistic about you, you are very important." ”

Hearing this, Yang Yiyiqiao's face blushed slightly: "This Li Jing..."

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

"Li Jing, what's the matter?"

"Help a couple of my brothers in the dorm to ask. ”

"Hmm~" Yang Yiyi thought for a while and said, "She is from the Department of Astronomy, and there are only 2 girls in that department, you have to let your roommates hold on." ”

"Well, I'll go back and tell them. ”

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

It seems to be a course designed for the National Day Golden Week holiday, and Chen Zhou and Yang Yiyi are out of class in the afternoon.

After eating, the two walked around the campus of Yan University for a while, and then went to the library.

Although it was a holiday, there were no fewer people in the library.

Chen Zhou and Yang Yiyi finally found two adjacent seats.

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

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

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

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

In less than a month, Chen Zhou has already 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 is that Yang Yiyi feels that these textbooks don't seem to have any connection with each other except that they all belong to the category of mathematics.

"Well, if you don't count the first book in the course, this is the 6th book. Chen Zhou nodded and opened the "Concise Tutorial of Complex Variable Functions" in front of him.

"That is to say, you have studied all the three textbooks in the class? plus those three, a total of 6 textbooks, how did you do it?" Hearing Chen Zhou's words, Yang Yiyi was even more surprised, and after thinking about it, she said again, "Chen Zhou, do you not sleep every day and stay up late every day to read?"

Chen Zhou smiled, looked at Yang Yiyi and said, "Are you stupid? Study also pays attention to the combination of work and rest, how can you not sleep? ”

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

Yang Yiyi: "Why?"

"That's because I'm so talented, of course. After Chen Zhou finished speaking, he smiled proudly at Yang Yiyi.

"Ahem!"

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

This cough instantly silenced Chen Zhou and Yang Yiyi.

Yang Yiyi didn't ask more, but made a decision silently in her heart, and she had 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, retracted his thoughts, and prepared to knock on this "Concise Tutorial of Complex Variable Functions".

This book, like the number textbook, was written by Mr. Yan University, and it also uses yellow skin.

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

As we all know, the concept of complex numbers originates from finding the root of equations, and in finding the roots of quadratic and cubic algebraic equations, there is a case of negative numbers squared.

For a long time, people could not understand this situation, and it was not until later, with the research of the great mathematical god Euler and another great cow D'Alembert, that the discipline of complex variable functions was created.

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

The most popular time for complex functions was in the nineteenth century, just as the direct extension of calculus dominated eighteenth-century mathematics, and the new branch of complex functions dominated nineteenth-century mathematics.

The mathematicians of the time recognized the complex variable function as the most abundant branch of mathematics and called it the mathematical enjoyment of the century, and some praised it as one of the most harmonious theories in abstract science.

Chen Zhou looked at the development history of complex variable functions, and sighed slightly, the development of every era always needs someone to stand up and lead.

Returning to the book "A Concise Course of Complex Variable Functions", Chen Zhou first read the table of contents, which is divided into eight chapters, including complex numbers and complex functions, analytic functions, Cauchy's theorem and Cauchy's formula, Laurent series, remains, harmonic functions, analytic development, and conformal mapping.

Things like complex numbers and series are familiar to Chen Zhou, but things like Cauchy's theorem and formulas are also the first time Chen Zhou has seen them.

After thinking for a while, Chen Zhou made up his mind that within three days, he would stumble on this textbook of complex variable functions.

On the one hand, the upgrade of the problem set is imminent.

On the one hand, it is to quickly brush out the task experience.

Chen Zhou took a sip of the spiritual medicine in the cup and began his journey of brushing books.

"Chapter 1, Complex Numbers and Complex Functions"

"1.1 Complex Fields"

This section mainly starts with the definition of complex numbers, introducing some of the basic properties of complex numbers.

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

This is his consistent habit, for the knowledge points that he is already familiar with, it will not take much time to read it again, and it can deepen his memory.

"Void Root I... Plural... Real part... Imaginary part... Imaginary numbers..."

"Complex Fields...... Complex Plane ...... Complex vector ......"

"Conjugated plural ......"

"1.2 Topological ...... of Complex Planes"

Chen Zhou is immersed in this ocean of knowledge, trying to fill the gaps in his knowledge.