A few days after Tomoko left, the students who had finished their winter vacation returned to school one after another, and the school gradually became lively again, and the new semester had arrived.

However, after the start of the semester, Pang Xuelin's first job is not to prepare for the Qiantang laboratory or accelerate the research and development of lithium-air batteries, but to prepare for interviews with graduate students.

In fact, Pang Xuelin should have taken graduate students last semester.

But in September, when he was in a coma for half a month, the school gave him three months off, so the matter of taking the students was naturally delayed again and again.

This semester, on the one hand, whether it is the carbon nano research center or the lithium-air battery, many fields of research have been on the right track, and Pang Xuelin also has spare time to start thinking about taking students.

On the other hand, Pang Xuelin is going to use the opportunity of recruiting graduate students to get Zhizi to his side, recruiting a few more students, so as to hide people's eyes.

"Professor Pang, this is a list of some of the students we have preliminarily screened to enter the re-examination, you can take a look first."

The secretary, Jiang Tao, put a thick set of student materials on Pang Xuelin's desk.

Since winning the highest national science and technology award and being elected as an academician of the Chinese Academy of Sciences, and Pang Xuelin has to serve as the leader of the preparatory group of the Qiantang Laboratory, therefore, after the start of school, the school has specially arranged a secretary team for Pang Xuelin to help him deal with some daily work affairs.

Jiang Tao is one of Pang Xuelin's new secretaries.

"So much?"

Pang Xuelin was taken aback, he estimated that there were at least hundreds of copies of this list.

Jiang Tao smiled bitterly and said, "Professor Pang, this list has been streamlined again and again, and all of them meet the requirements of the retest. Since we found out that you were looking for graduate school, we received more than 1,000 applications from all over the world, and we we've eliminated 90% of the applicants, leaving the 100 or so people who are quite good in terms of resumes and grades. ”

"You put it first, I'll take a look later!"

Pang Xuelin was also a little speechless.

You know, this time he is only going to recruit three students in the direction of mathematics, one in the direction of electrochemistry and one in the direction of carbon nanomaterials.

1,000 people competing for five places is already tragic enough.

If you think about the 1,000 people who submitted the application are all top students from major universities around the world, it is enough to show how difficult it is to become a doctoral student under Pang Xuelin.

Pang Xuelin opened these student files and read them one by one.

"Alexander Oleksey, gold medalist of the International Mathematical Olympiad, graduated from Lomonosov Moscow State University, and published papers in JAMS (Journal of the American Mathematical Society, which belongs to the four major journals in mathematics) during his graduate studies......"

"Sophie Heyman, gold medalist of the International Mathematical Olympiad, graduated from the University of Bonn, I went, this girl turned out to be a ...... recommended by Schultz"

"David Harque, a graduate of the Ecole Supérieure de Paris, has ...... Another gold medalist in the International Mathematical Olympiad"

Meng Yao, gold medalist of the International Mathematical Olympiad, graduated from Peking University...... The people from the School of Mathematics of Peking University actually came to me to study for a doctorate......"

Ai Ai, graduated from the School of Mathematics of Jiang University with a bachelor's degree, and is a member of the Ponzi Geometry Seminar...... This girl seems to have a little impression that she seems to have a good talent for mathematics......"

"Wang Zhi, who studied mathematics at Harvard as an undergraduate, is currently a graduate student at Princeton University, and just published a paper on the proof of the hail conjecture in the Annals of Mathematics a month ago......"

……

After a long time, Pang Xuelin finally found Zhizi's information.

Pang Xuelin shook his head with a smile, pondered for a moment, he selected twenty lists from them, and then picked up the phone on the table and called Jiang Tao in.

"According to the list of twenty people I circled, inform them to prepare for the interview, if they can come to Jiang University, it is best to come, if it is inconvenient, then arrange a video phone interview! It's best to get it done this week! ”

"Okay, Professor Pang!"

Jiang Tao's movements were fast, and that afternoon, the first interviewer appeared in Pang Xuelin's office on time.

It was that Jiang University student Ai Ai.

Looking at the beautiful girl in front of him wearing a short down jacket, miniskirt with black leggings, and high boots, Pang Xuelin looked through her information and said, "Let's introduce myself first." ”

"Professor Pang, my name is Ai Ai, mixed Chinese and English, my father's surname is Ai, and my mother's name is Alice, so they call me Ai Ai, do you remember me? Two years ago I said I was going to apply for your graduate school, and now I'm here ......"

Ai Ai's eyes looked at Pang Xuelin without blinking, and there was a feeling that fans had seen an idol.

Pang Xuelin smiled: "It seems that you are very confident!" ”

"Of course!"

The corners of Ai Ai's mouth curled up slightly, and she said with a smile.

Pang Xuelin said: "Self-confidence is a good thing, so let's officially start." You spent a year in the Ponzi Geometry Seminar last year, and I heard from Professor Shinichi that you performed very well, and in the middle of it, you also published two articles using Ponzi geometry theory to study the problem of local s-arc transfer complete bipartite graphs in algebraic graph theory and edge transfer bipartite maps in topological graph theory. ”

"The study of local s-arc transport diagrams originated with Tutte's pioneering work in 1947 that a 3-degree s-arc transport diagram satisfies s≤5...... In 1981, Weiss extended this work to arbitrary degrees, making the study of s-arc transfer graphs a core field of algebraic graph theory, and hundreds of papers have been written on this type of graph...... Over the past 20 years, the Giudici-Li-Praeger theory, developed by algebra leader Preg and his colleagues, has provided an effective tool for studying symmetry graphs...... Last year, I solved the problem that the fundamental graph is a complete bipartite graph of local 2-arc transfer and local primitive, based on the relevant theory of Ponzi geometry, and the results are respectively theorem 3.2 and inference 3.1 in Chapter 3 of my published paper, and theorem 4.1 and inference 4.1 in Chapter 4 of my published paper, respectively......."

As for the embedding of complete bipartite graphs on orientable surfaces, this theory first originated in 1979 in the British mathematician Biggs and White's monograph "Permutation Groups and Combinatorial Structures", which is a very active research topic in topological graph theory in recent years. In the theory of cavity embedding on Riemannian surfaces studied by Grothendieck, the bipartite map on the directed surface corresponds to the algebraic curve defined on the number field (Q) (algebraic number), so the study of the bipartite map of edge transfer is helpful to study and characterize the algebraic curve......"

Ai Ai's tone was unhurried, and he explained to Pang Xuelin some of his research and ideas on the use of Ponzi geometry in algebraic graph theory and topological graph theory.

Pang Xuelin nodded from time to time and made some notes on the manuscript paper.

Although this girl's figure and appearance are eye-catching, when she really started to discuss math problems, Pang Xuelin found that her talent in mathematics was easy for people to ignore her appearance.