The Science Fiction World of Xueba

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 has arrived.

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

In fact, Pang Xuelin was supposed to lead graduate students last semester.

But the school gave him a three-month leave for the half-month-long coma in September, so the matter of bringing the students was naturally delayed again and again.

This semester, on the one hand, whether it is the carbon nanometer research center or the lithium-air battery, the research in many fields has been on the right track, and Pang Xuelin also has free time to start thinking about leading students.

On the other hand, Pang Xuelin plans to use the opportunity of recruiting graduate students to get Tomoko to his side, and recruit a few more students to deceive others.

"Professor Pang, this is the list of some students who entered the re-examination that we have initially screened, please take a look first."

Secretary Jiang Tao put a thick student information on Pang Xuelin's desk.

Since he won the National Highest Science and Technology Award, he was elected as an academician of the Chinese Academy of Sciences, and Pang Xuelin was going to be the head of the preparatory team of the Qiantang Laboratory. Therefore, after the start of the semester, the school specially arranged a secretarial team for Pang Xuelin to help him with some daily work.

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

"so much?"

Pang Xuelin was taken aback. He estimated that there were at least a hundred copies of this list.

Jiang Tao smiled wryly and said, "Professor Pang, this list has been streamlined several times, and all of them meet the re-examination requirements. Since we knew you were going to recruit graduate students, we have received more than 1,000 applications from all over the world, and we have eliminated a hundred of them. Ninety percent of the applicants, and the rest of the hundred or so people, are quite excellent in terms of resume and grades."

"Leave it alone, I'll see later!"

Pang Xuelin was also a little speechless.

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

It is already tragic enough for a thousand people to compete for five spots.

If you consider that the thousand people who submitted applications are all top students from famous universities around the world, it is enough to show that they want to become doctoral students under Pang Xuelin,

How difficult is it.

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

"Alexander Oleksey, a gold medalist in the International Mathematical Olympiad, graduated from Lomonosov Moscow State University, and even published a paper in JAMS during his graduate studies..."

"Sophie Heyman, a gold medalist in the International Mathematical Olympiad, graduated from the University of Bonn, let me go, this girl was recommended by Schultz..."

"David Halke, graduated from the Ecole Normale Supérieure in Paris, has ... another gold medalist in the International Mathematical Olympiad"

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

"Ai Ai, a graduate of Jiang University of Mathematics, a member of the Ponzi Geometry Seminar... This girl seems to have a little impression, and her mathematical talent seems to be pretty good..."

"Wang Zhi, studying in the Department of Mathematics of Harvard University, is currently studying at Princeton University. He just published a paper on the proof of the hail conjecture in the "Annals of Mathematics" a month ago..."

...

After searching for a long time, Pang Xuelin finally found Sophon's information.

Pang Xuelin shook his head with a smile, pondered for a moment, he selected 20 lists, then picked up the phone on the table and called Jiang Tao in.

"According to the list of 20 people I circled, let them know that they are preparing for an interview. If you can come to Jiangda, it is best to come. If it is not convenient, then arrange a video phone interview! It is best to get it done this week!"

"Okay, Professor Pang!"

Jiang Tao acted quickly, and the first interviewer showed up in Pang Xuelin's office on time that afternoon.

It was Ai Ai, a college student from Jiangxi.

Looking at this beautiful girl in a short down jacket, miniskirt, black leggings, and high boots, Pang Xuelin flipped through her profile and said, "Let me introduce myself first."

"Professor Pang, my name is Ai Ai, I am of Chinese and English descent, my father's surname is Ai, and my mother's name is Alice, so they call me Ai Ai, do you remember me? I said two years ago that I would apply for your graduate degree, Now here I am..."

Ai Ai stared at Pang Xuelin without blinking, feeling like a fan meeting an idol.

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

"of course!"

Ai Ai raised the corners of her mouth slightly, and said with a smile.

Pang Xuelin said: "Confidence is a good thing, so let's start officially. You stayed in the Ponzi geometry seminar for a year last year. I heard from Professor Xinyi that your performance was very good. You also published two papers using Ponzi geometry. Theoretical research on local s-arc transfer complete bipartite graphs in algebraic graph theory and edge transfer bipartite maps in topological graph theory, please talk about your own research in this area."

Ai Aidao: "The research on the local s-arc transfer graph originated from Tutte's pioneering work in 1947, that is, the 3-degree s-arc transfer graph satisfies s≤5... In 1981, Weiss extended this work to any degree , so that the study of s-arc transitive graphs has become the core field of algebraic graph theory. So far, hundreds of papers have studied this type of graphs... In the past 20 years, the algebraic leader Praeger and his colleagues developed the The Giudii-Li-Praeger theory provides an effective tool for studying symmetric graphs... Last year, I solved the problem that the basic graph is a complete bipartite graph with local 2-arc transit and local primitives based on the relevant theories of Ponzi geometry. The results are respectively in Theorem 3.2 and Corollary 3.1 in Chapter 3 of my published paper, and Theorem 4.1 and Corollary 4.1 in Chapter 4..."

"As for the embedding of complete bipartite graphs on orientable surfaces, this theory originated from the monograph "Permutation Groups and Combinatorial Structures" written by British mathematicians Biggs and White in 1979. It is a very active topic in topological graph theory in recent years. research topic. In Grothendieck’s theory of cell embedding on Riemannian surfaces, the bipartite map on the directed surface corresponds to the algebraic curve defined on the number field, so the bipartite map to study the edge transfer has Helps study and characterize algebraic curves..."

Ai Ai's tone was unhurried, explaining to Pang Xuelin some of his research and ideas on algebraic graph theory and topological graph theory using Ponzi geometry.

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

Although the girl's figure and appearance were eye-catching, when she really started discussing math problems, Pang Xuelin found that her talent in mathematics could easily make people ignore her appearance.