"Ahem!", Professor Nan looked at it for a long time, the teaching assistant was wearing high heels, and he didn't dare to say anything when he saw Professor Nan's serious expression, so he only changed the center of gravity through small movements to let the two feet take turns to rest, but even so he couldn't hold on until now, so he had to cough twice to remind Professor Nan.

"Hmm, what are you doing standing here?", Professor Nan's face was full of dissatisfaction at being interrupted, and his tone reminded the teaching assistant of how he felt when he received the phone call last week when he and her boyfriend were sexting.

"I'm sorry, but", you're not tired from standing, but I'm wearing high heels!

Before she could finish speaking, Professor Nan said sharply, "Go and call Lu Qiujian and ask him to come to my office immediately, go now!"

"Okay! I'll go right away!", it seems that something big has happened! Could it be that Lu's exam results have angered him? The teaching assistant didn't dare to say more, and hurriedly returned to his seat and flipped through the address book.

Professor Nan also went back to his office, took out his mobile phone and flipped out a number and dialed it, "Hey, William, are you still in school? Great, can you come to my office? No, no, no, I know Christmas is coming, but trust me, you won't regret coming is about that question, yes, it's the one you've been researching, I've found something interesting here, if you don't come, I'll call Hamilton or Friedman! I'm sure they won't care about Christmas!" Okay, I'll be waiting for you in the office!"

As soon as he hung up the phone, Professor Nan poked his head out of the office and shouted, "Anna!

"Oh my God!", the frightened Anna accidentally dropped the address book she had just found on the ground, picked it up and said, "Right now, right away! Please give me a little more time!"

Hmm~~ Professor Nan shook his head and returned to the office, but he couldn't calm down, pacing around the office while thinking about Lu Qiujian's solution ideas.

"Hey, hello!", just after two rings, Lu Qiujian, who was lying on the bed, pressed the answer button of Motorola V730, "This is Lu Qiujian!"

"Hello, I'm Anna, the teaching assistant! We just met in the afternoon, do you remember?", Anna guessed that the reason why Professor Nan was so strict might be because Lu Qiujian's performance in the afternoon was too poor, so she didn't speak in a polite tone.

"Is there something wrong?", Lu Qiujian heard dissatisfaction from her tone, so he also replied firmly.

"Professor Nan asked you to come to his office now!", Anna was full of depression, everyone else was preparing to pack up and go home for the Christmas purchase, but she didn't know what time she would leave work.

"I'm sorry! According to the school's arrangement, it's already a holiday! I have no obligation to go to the professor's office at this time!", Lu Qiujian vented his anger angrily.

"It's about your exam!" Professor Nan asked me to call you as soon as he read your answer sheet!", Afraid that he would hang up the phone, Anna quickly explained, and her tone of voice softened a lot, "Don't you want to know your exam results?"

"Okay, I'm in the dormitory now, I'll go over right away!", after a moment of silence, Lu Qiujian agreed.

"Anna, hasn't the call gotten through?", Professor Nan's head stuck out again.

"He's in the dormitory right now, come right away, it's about twenty-five minutes' walk from Butler Residential College, please be patient!", Anna showed the professional quality of an assistant at this time, and gave Professor Nan a precise number according to her own judgment.

"Twenty-five minutes?", Professor Nan muttered, as if he thought it was too long, shook his head and began to pace around the office again.

Ten minutes later, Anna knocked on the door of Professor Nan's office with someone to come, "Is Lu Qiujian here?", Professor Nan shouted as soon as he came to open the door, and only when he saw clearly that the person behind Anna stretched out his hand with a little regret, "Welcome, William!"

This William is not Professor William Timothy Gowers, but William Thurston, who looks to be in his fifties, with a large hooked nose and a pair of black-rimmed glasses, another Princeton Fields Medal winner who won the prize in '82 for the leaf-like structure and classification of three-dimensional manifolds, along with the Chinese mathematician Yau Chengtong.

"Where's the thing?", Thurston walked into Professor Nan's office and looked around, without being polite.

"Here!", Professor Nan reluctantly handed over Lu Qiujian's answer sheet, "One of my students made it, although it is only the beginning, I don't seem to have seen anyone else use this method. ”

"I'll take a look!", Thurston licked his lips subconsciously as if he had been hungry for a long time and was lucky enough to get a feast, and took the thin pieces of paper with a slightly trembling hand and browsed it.

"You know, I haven't studied this problem very deeply, and I only know a little roughly, and I don't know exactly how far this research has been done and what new methods there are, so I hope you can give me an accurate evaluation!", Professor Nan said, rubbing his hands.

"Aha, I see he's using my own method!", Thurston said excitedly, pushing his eyes on the big eagle's hooked nose, "and Professor Hamilton's Ricci flow, but how is he going to solve the problem of the increasing singularity in the Ricci flow?

Thurston flipped to the next page with a trill, and then let out an angry roar, "FXXK!"

"Well, I think it's a misunderstanding!", Professor Nan spread his hands embarrassedly, "This is the exam question that one of my students completed, and he completed so much content in two hours of exam!"

"What! is this the exam question you give your students?", Thurston's eyes widened, and he didn't know what to say!

At this time, the knock on the door sounded again, and Anna's voice came from outside, "Professor Nan, Lu has arrived!"

"Come in!", Professor Nan hurriedly welcomed Lu Qiujian in, "What do you want to drink?"

Hmm, why does Professor Nan have this attitude? And why is Professor Thurston here? Lu Qiujian was stunned for a moment before saying, "A cup of black tea, thank you!"

Well, I guess someone has already guessed which problem this is. In addition, Mr. Yang opened a new book "The Whip of the God of Basketball" at the starting point, Mr. Yang's basketball novel is written very well, if you are interested, you can take a look!