The one-hour interview time was unconsciously. After examining Ai Ai's professional skills, Pang Xuelin smiled and said, "Ai Ai, the last question, can you tell me why you chose mathematics?"

Ai Ai pondered for a moment and said, "As far as I know, no subject has changed my way of seeing things as profoundly as mathematics. I learn mathematics very slowly because I have difficulty accepting some mathematical ideas, or rather The philosophical thinking behind mathematics, but once accepted, it feels completely new. Especially when I understand a proposition or concept, I am often amazed by mathematics. "

"When I studied abstract algebra two years ago, those abstract definitions didn't surprise me. But the correspondence of Galois' theory and its subsequent application to ruler mapping and root finding formulas really surprised me. From the solvability of the group to whether or not to find the root, what is not relevant is connected, and I feel that I have found the truth of the world! "

"Learning exchange algebra, I was surprised by a small ring. People can actually study so many structures and theories. When we found the ideal, we had a quotient; but after we discovered the prime ideal, we had localization. The sub-world has become extremely exciting. Especially the Krull ring, it has exhausted eighteen martial arts, which is amazing. "

"I have been studying category theory for a long time. At the beginning, I really didn't know what it was going to do, a new name? But when you accept the setting, the more you learn, the more interesting it is. The teacher once said: Category The theory is one-dimensional abstraction higher than mathematics. This sentence was completely difficult for me to understand at that time. Only in retrospect, it is really this feeling. "

"Algebraic topology is also a very interesting subject. When I first learned it, the teacher talked about K-theory from the basic homology definition, with the complete Bundle classification theory, and finally wrote 700 pages of notes. Learning broke down ... "

"Combination is even more interesting. Combination is often counting, but how to count is very important. Viewing from different perspectives directly affects whether you can 'count' a number. Under different perspectives, the same number will It is related to different things. Can you imagine that the number of elements of a ridge group in a symmetric group has something to do with tossing a coin? This kind of unrelated phenomenon has a mathematical inner relationship ... ... "

...

"So personally, the mystery of mathematics is greater, and it makes me more willing to explore it. Of course, Professor Pang, are you also an important reason?"

"I?"

Pang Xuelin pointed at himself, somewhat surprised.

Ai Ai said with a smile: "I'm a big fan of you. It's a great happiness for me to study under you. And I also believe that with you, I will be able to take a more academic path in the future. far."

Pang Xuelin laughed: "You are so confident that you can pass the interview? You need to know that there are many competitors."

Ai Ai shrugged and said, "I have done my best, whether or not I can study under your hands, I feel that I have no regrets. Of course, even if I miss you in the end, I will still be academic Keep going on the road ... "

Pang Xuelin nodded and said: "Very good, today's interview will come here first, there will be results in a week, you can go back and wait for notification."

Ai Ai blinked and said, "Professor Pang, can I ask, is my hope high?"

Pang Xuelin laughed: "You are the first to come here for an interview. Whether you can pass or not depends on the situation of the competitors behind you. Of course, your performance is very good today, so the hope to stay is not small ... ... "

Ai Ai laughed and said, "Professor Pang, I'm bothering you today. If nothing is wrong, I'll go first!"

Speaking, Ai Ai straightened up and picked up his backpack.

Pang Xuelin laughed: "Okay, see you then!"

"Professor Pang, I am looking forward to seeing you again!"

Ai Aiyan smiled and turned to leave Pang Xuelin's office.

Pang Xuelin smiled and shook her head.

He was actually quite satisfied with this girl. Although his personality was a little off-line, he had a set of ideas about mathematics and was very spiritual.

The following week, Pang Xuelin spent the non-stop interview.

The outstanding level of these short-listed students is somewhat beyond Pang Xuelin's expectations. Almost every student has the potential to make great efforts in the fields of mathematics, materials science, and electrochemistry.

In the end, Pang Xuelin determined the list of five finalists.

There are three graduate students in mathematics: Sophie Hyman, David Halke, and Ai Ai.

Sophie Hyman, a little German girl with freckles on her face, is only eighteen years old this year, but she has completed her undergraduate studies at the University of Bonn.

Her personality is a little silent, but she is amazingly talented in mathematics.

Schultz originally liked her and was planning to focus her training, but she told Schultz that she wanted to learn Ponzi geometry.

After graduating from undergraduate school, Schultz recommended her to Pang Xuelin.

When she came to the interview, instead of talking like Ai Ai, she directly asked Pang Xuelin to get a blackboard. It took half an hour to use a very clever method for two Perturbed generalized Kadtsev-Petviashvili equations are classified approximately symmetrically, and invariant solutions are constructed for several of them.

So Pang Xuelin directly clapped and left her.

As for David Halke, during the interview, this guy showed Pang Xuelin some of his notes while studying Far Abel geometry, and some of his ideas and concepts coincided with Ponzi geometry.

You know, this guy is only 20 years old this year.

When Pang Xuelin was in the rescue world of Mars, one person thought on Mars for three full years. Only uukanshu.com figured out some of these joints, and he actually completed such work independently at this age.

In terms of mathematical talent, Pang Xuelin before genetic modification is far worse than the other.

In addition to these two outstanding, others are excellent, but the overall performance is similar.

In the end Pang Xuelin chose Ai Ai who graduated from Jiangda University.

After all, he recruited graduate students by himself, and none of Jiang's college students accepted it.

As for the two postgraduate places in the field of carbon nanomaterials science and electrochemistry, Pang Xuelin gave Meng Yao and Tomoko respectively.

The Peng Xuelin, who graduated from the Mathematics Department of Peking University, learned at the interview that he had minored in materials science when he was at Peking University, and he was not much less interested in computational materials science than mathematics. .

The last Tomoko need not say, the future lithium-air battery needs her to take the helm, and letting her come to study a graduate student in electrochemistry, it can be considered as a preparation for the future.