Just turned over a new leaf and became a wise and intelligent student

Chapter 263: Like a team of chopped pepper fish head
"Teacher, is the package nice?"

Xue Xueqing grabbed her long yellow hair, stood in front of Xu Qingshan's desk, lowered her head and tried to look at her toes, but because of her chest, she could only look at her own capital nervously.

"you"

Xu Qingshan looked at the bright colors all over the room, and for a moment he didn't know how to comment on them.

I was just given the department key yesterday, and today the department has changed completely.

"You have strong execution ability."

Xu Qingshan had words on the tip of his tongue, but he still didn't criticize this diligent and enthusiastic girl.

But now the logo on the door, painted in neon colors that resemble a cyberpunk style, is really eye-catching.

【Qingshan Group】

If you don’t know, you might think this is some Sakura Black Society.

"Really? Teacher, you like it too! Right!"

Xiao Xue seemed to have received great encouragement. He jumped on the spot excitedly, his heart surging and charming. However, Jiang Huanxi was right beside him, so Xu Qingshan quickly withdrew his gaze.

"Okay, go back and look at the problem with the coordination and analysis. I'll give you three days."

"Teacher, I have already read the harmonic analysis. I can try to do part of it."

Before Xu Qingshan finished speaking, Xiao Xue shouted happily, overwhelmed by the excitement of being recognized.

"Forget it, Wang Wei, just close the door, or else the noise will disturb other departments."

Xu Qingshan didn't want to close the door, but Xiao Xue was making too much noise.

Fortunately, there was Comrade Xiao Jiang in the room to accompany me, and since the incident in the south, the teacher was allowed to install a camera in the room for surveillance, which could not only help me prove myself at critical moments, but also monitor whether anyone came to steal the research group's information.

"Okay, take a look at this. If you can explain it clearly, then I can start assigning you tasks."

Xu Qingshan flipped through the documents at hand and found a part of the work he had split out. He handed it to Xue Xueqing, who had impatiently taken a pen and sat in front of his desk waiting for the information.

"Actually, you can go back to your own place and do it."

Xu Qingshan reminded him.

"Teacher, even though you are very strong, don't underestimate me!"

"A little reconciliation and analysis, take it, take it!"

Xiao Xue didn't even look up. He read the materials quickly, and his hands moved in sync.

Xu Qingshan's eyes fixed.

This lively guy is really something. He can read and write very fast, can translate very fast, has an active mind and is very efficient.

You know, the documentary materials Xu Qingshan gave her were the original English versions.

Moreover, Xiao Xue didn’t even make a draft, he just wrote the manuscript directly.

However, now Xu Qingshan really understood why Zong Chuanming wanted to leave his students to him.

Teachers both love and fear capable problem students.

It hurts, right? That’s not a big deal. These talented problem students can ride on your head and make you crazy.

No matter what, if you don’t have a similarly young mindset and sufficient strength, you really can’t control it.

It seems that it is the stronger young teachers who can make these problem students want to actively catch up and be convinced.

But even at Peking University, there are not many top-notch young talents like this, and Xu Qingshan is considered the best.

If Zong Chuanming doesn't put the blame on him, who else can he put it on?
"Teacher! I've got it done!"

Xiao Xue confidently turned the manuscript in his hand and handed it to Xu Qingshan.

"So fast?"

Xu Qingshan was a little surprised.

I seem to have underestimated them, but I am right. As doctoral students from the top universities in the country, how could they be ordinary people?
"Let me see."

Xu Qingshan took the manuscript and looked at it carefully.

After a while.

Xu Qingshan looked up with some surprise at the confident girl sitting in front of him, and nodded.

"Yes, then I'll give you this information."

He pulled out another folder from his side, which was the part he had sorted out last night.

"Guaranteed to complete the mission!"

Xiao Xue accepted the task with full confidence.

The girl had just moved away, the chair was still warm, and Xu Qingshan hadn't had time to look at his other document, when Wang Wei, with his long straight black hair, floated over like Sadako.

"Xiao Wang, do you want to tie your hair?"

Xu Qingshan pursed his lips and made some suggestions.

"Dah ah."

Xu Qingshan:
Why are you speaking Japanese again? You’re really a 2D otaku.

You have to know that in 2009, D otaku is not yet a mainstream hobby, and it can be considered a rare talent.

"Okay, what do you think of the branch topic we talked about last night?"

Xu Qingshan looked through the documents he had prepared for Wang Wei.

"No problem. I have the basics and have learned everything. I can do it right away."

"so smart?"

Xu Qingshan said this subconsciously, but he felt a resentful gaze coming from the opposite corner.

He looked over and saw Xiao Xue staring at him with a pair of resentful eyes, like a female ghost who had been dead for hundreds of years.

No, so what?
Before Xu Qingshan even opened his mouth to ask, Xiao Xue took the initiative.

"Teacher, why do you say Wang Wei is great, but not me?"

".You are amazing too."

Xu Qingshan felt that this was not the Institute of Mathematics of Peking University, but simply the kindergarten branch of the Institute of Mathematics of Peking University!

What is this?

"Then this is for you. If you don't understand, ask."

Xu Qingshan found that since the establishment of his research group, every day was a tiring day, even though it was only the second day.

"Okay, teacher."

Wang Wei nodded seriously. Xu Qingshan saw that the amplitude of her nod was almost like a kowtow, and subconsciously extended his hand to her.

Sure enough, the girl hit her head on the table again. Fortunately, this time she was cushioned by Xu Qingshan's hand, so she didn't feel any pain.

"teacher"

For some reason, tears welled up in Wang Wei's eyes.

Xu Qingshan suspected that she was thinking of some anime and waved his hand.

"Go to work, stop messing around."

"Ok!"

"Ugh."

Xu Qingshan sighed, turned around and saw Jiang Huanxi looking at him with curved eyebrows and full of smiles.

"Don't laugh either. I'll leave these two to you."

Xu Qingshan handed the last two documents to Jiang Huanxi.

Now that he had a general understanding of Xue Xueqing and Wang Wei's research abilities, he could let go, roll up his sleeves and get to work.

In this small building that belongs exclusively to the Institute of Mathematics of the School of Mathematics at Peking University.

Xu Qingshan's department can be said to be unique.

The brightly colored graffiti and logos form a sharp contrast with the boring colors of beige and gray.

Fortunately, Xu Qingshan’s department is at the end of the corridor on the second floor, in the corner.

The department opposite his was not used by anyone, and normally no one would come and see such a wonderful door in his department.

But in this unique department.

But it has a vitality that is different from other departments.

Perhaps because of the average age, the average age of Xu Qingshan's department's research group is only 22 years old, and the two doctoral students raised this figure.

Compared with other departments where the youngest staff is around 28-30 years old, they are a completely new force.

Perhaps staying in a boring environment for a long time will indeed affect people's work efficiency.

In other departments, doctoral students and researchers write, read, make a cup of tea, enjoy the scenery, chat, and finally return to their workstations to check how much work they have done that day.

Before they start working, they will roughly plan their daily work content in advance based on their experience.

What about the key nodes that cannot be researched?
It doesn’t matter, it’s a common occurrence, just take your time.

But it’s different in Xu Qingshan’s department.

"Teacher! Fourier transform 1 and 2 are isometric linear transformations, so the only extension to a bounded linear operator is also an isometric linear operator, right?!"

"Yes, the unitary operator is the isometric linear surjection on the original L2Rn."

"Good teacher!"

"Didn't you learn it well? How come you forgot such a basic knowledge point?"

"I'm just confirming it again!"

"Teacher! I have a question too. I don't know which direction should I go for. Is it better if I do both?"

"Just find the upper bound of the linear sensitivity. Look at the paper co-authored by Van Melkebeek in 2007. The upper bound of the linear sensitivity of Boolean functions should be O(nth power divided by log n). See the process for yourself."

"Qingshan, here is the only sensitive part, please see if my idea is correct."

"Well, no problem, just keep going."

In a small department.

The sounds came and went.

Although it may sound very noisy to those who don't understand what is going on, to the four people involved, this atmosphere is very harmonious.

It seemed that when they were working at their desks, the beauty of mathematics turned into musical notes flowing between them.

They seemed to be performing a grand concert with the paper and pens in their hands.

The conductor and director of this concert was Xu Qingshan, who sat behind his desk and quickly processed various documents.

Unlike the three girls who focused on academic branch research and core derivation, Xu Qingshan was almost operating in multiple threads at an ultra-high frequency.

Not only did he take turns answering the questions that the three girls encountered during their research, he also used his statistical foundation to improve his knowledge of cryptography, especially in the construction of cryptographic hash functions and pseudo-random number generators with high randomness.

If the research teams at the world's top universities and research institutes can be compared to cars.

The whole world is filled with all kinds of top-notch cars.

There are super teams that are equipped with many industry leaders. Although the team members are not particularly large, each of them is the top one. In the track they are targeting, they are irreplaceable top supercars. Some teams even have no competitors at all.

Some of them have strong team strength, many team members, and are large off-road SUVs that are very reliable and stable.

Some are very normal coupes with low-key and luxurious appearance and good performance.

As for Xu Qingshan and the others?
you could put it that way.

Xu Qingshan's research team is like a Wuling Hongguang mini with a V12 engine, a super strong "heart" and a chopped pepper fish head with absolute control over the steering wheel.

It looks pink and tender, and is small and cute.

But when it really starts running, everyone will be amazed at its amazing speed and stability.

"Teacher! This part is done!"

"Teacher! I'm done too."

"Qingshan, I'm almost there too. I should be done by the time you finish reading this."

It wasn't even time for dinner yet. Xu Qingshan received perfect answers from his team members.

Although the tasks he divided out were not many, Xu Qingshan reserved three days for them.

"Let me take a look. If everything is ok, you can take a rest for two days and I will give you the new part."

Xu Qingshan took the folder back into his hand.

It will be much more convenient if information-based office becomes popular in the future. Now most people print out papers for revision, which is relatively easier to record and archive.

"Teacher! I don't need to rest, I can still do it!"

"Me too!"

Xu Qingshan looked at the two girls in front of him, who were holding their heads high and looking as if one was not convinced by the other. For a moment, he didn't know whether he should be glad or sad.

This is his first time teaching students full-time, but he was pushed by the students for the first time?
It is said that some graduate students will push their supervisors, are they just these two?

"Okay, do it if you want to. Here, these two, this one goes to Xiao Xue, and this one goes to Xiao Wang."

Xu Qingshan picked two for them. He had prepared them, but the timeline was advanced.

"Teacher, I told you! I am Xiao Wang, not Xiao Wang Ba."

"Good good."

Xu Qingshan sorted out their parts and found that they were indeed very good, with appropriate details and beautiful steps. The whole derivation process had a lot of mathematical beauty. Although it was only a small step in the entire subject, it had strong plasticity and integration.

"Xiaoxi, just take a break. Stop using your brain so much. Help me sort it out. I'll work with you once I solve this problem."

"OK."

Jiang Huanxi is a virtuous wife who works hard and never complains. She will agree to whatever Xu Qingshan arranges.

It's just that her voice is a little weak now, and she doesn't sound very energetic.

"Thank you for your hard work. They may be very excited because the research group has just been set up. Once their excitement has passed, we can slow down the pace."

Seeing that Jiang Huanxi's response was not very spirited, Xu Qingshan thought she was unhappy.

"Hmm? Slow tempo? No need to slow tempo."

Jiang Huanxi was stunned for a moment, then came to his senses, looked at the young man in front of him with handsome eyes and eyebrows, and said.

"and you."

Xu Qingshan gestured to Jiang Huanxi hesitantly.

The tacit understanding between the two naturally made the girl understand immediately.

"Oh, no, I was just thinking about how the subsequent nodes of the two parts I just made should unfold. I'm making some preparations in advance."

Jiang Huanxi said seriously.

Xu Qingshan smiled with some difficulty.

broken.

It feels like there are three super motors vibrating wildly in this room.

When I first came to this Institute of Mathematics, I thought this environment and this quietness were perfect for slacking off.
Moreover, I also saw them in other rooms drinking tea, reading journals and engaging in academic chats.

But I haven't even had the chance to sit here and read academic journals peacefully, so why am I being pushed around by the three beautiful girls around me?
"Okay, then you do it first, and I'll give you the rest later."

Xu Qingshan kept smiling.

It’s a long-lost feeling.

Xu Qingshan felt that the last time he had so much energy for study and research was probably when he finished going through the OJ question bank all at once.

Although the difficulty level is not the same.

But they are consistent in their subjective initiative.

He now had only one thought left in his mind.

Open the book!
Since the three girls in the department all want to get involved, how can he be afraid?

He was too gentle and too considerate to women before.

From this moment on, he will let the girls know what cattle and horses are!
Small house.

Always busy with work.

It is obvious that none of the four people in this room is in urgent need of scientific research results. There is still a long time before graduation, and no one needs to rush to produce high-quality journal papers to evaluate their professional titles.

But quietly.

This department, which was gradually dyed with colors and filled with vitality, became the most lively place in the entire Institute of Mathematics.

At the beginning, there were few people in the corner and no one noticed.

However, there were a few times when someone came to Xu Qingshan to ask for innovative ideas, and they were shocked by the atmosphere of Qingshan's research group before they even entered the room.

These young people are really risking their lives!

How can you do scientific research like this?
Are we going to let middle-aged and elderly people survive?
Quietly, there were fewer people drinking tea and chatting in the Institute of Mathematics, and it was not very noticeable.

But the Wang research group in the corner of the second floor has quietly given this seemingly peaceful, simple and comfortable small building a unique vitality and enterprising spirit that is gradually spreading.

After a while, the three girls gathered around Xu Qingshan's desk, looking at the two pieces of paper spread out on the table.

Jiang Huanxi sat next to Xu Qingshan, her eyes shining.

The two girls across the table looked left and right as if they had seen something new. They wanted to reach out to take it, but they were embarrassed and felt very awkward.

They are just two pieces of paper, but in their eyes they are as heavy as a thousand pounds.

"teacher"

The hesitant and dragging voice was not from Wang Wei, but from the always impetuous little yellow-haired Xue Xueqing.

Xu Qingshan looked up.

This girl didn't have her usual craziness, nor did she have the courage to transform her entire office into a graffiti style just because of a disagreement over the past week. Instead, she pursed her lips tightly, had misty eyes, clenched her fists, and moved her legs apart, looking like she was in a hurry to pee.

"what happened?"

“Is this how we finish our work?”

Xue Xueqing bit her red lips so hard that they left marks.

"I mean, our project, the Boolean function sensitivity conjecture, has been solved just like that?"

"Yes, what else?"

"Just two pieces of paper?"

"This is just for the sake of rigor of the argument. If you want, you can write it clearly in a Weibo post."

Weibo has become popular now. Xu Qingshan is using it, and of course, trendy girls like Xue Xueqing who can even do graffiti will also use it.

Xu Qingshan looked at Xue Xueqing with a strange look.

This girl's expression now
Why does it look so much like Xiaoxi's reaction at special times?
Is it
"Woo! That feels so good!"

Xue Xueqing jumped up on the spot as if she was having a party after being suppressed, and hugged Wang Wei, who was blinking beside her, with a scream.

Wang Wei was like a little wooden man, staring at the two pieces of paper. Even when Xue Xueqing was holding her and jumping around, she remained very calm.

Of course, that was just at first glance. In fact, just observing her trembling hands grabbing her skirt would tell you how excited she was.

Xu Qingshan smiled and shook his head, then held Jiang Huanxi's hand.

Let’s have some fun, it’s indeed worth having fun.

Fortunately, the door was closed, otherwise with such noise, everyone in the building could have been killed.

Wait until your emotions calm down.

Only then did Xu Qingshan hear Xiao Xue's confession.

"Teacher, you are really amazing! From undergraduate to doctoral study, for so many years, this is the first time I feel that doing scientific research is so easy and simple! I love you so much, teacher!"

Xu Qingshan glanced at the smiling Jiang Huanxi and shrugged.

"It's good to be happy, but don't love me. It's fruitless. Your little mistress is here."

"So what brother means is that we can love each other in private?"

Jiang Huanxi said with a smile.

Xu Qingshan shuddered. Where did this girl learn these words?

"No, not in private."

Xu Qingshan turned his head and saw the gossipy and teasing eyes of the two girls again, and raised his hand helplessly.

"Dongli will be open tonight, and I will give you your allowance tomorrow."

"Yeah! Long live the boss!"

"Don't worry, I'll post the paper on arXiv."

Xu Qingshan waved his hand and asked the two girls to return to their seats first, while Jiang Huanxi stayed beside him to help organize and review the final version of the paper.

"It's really hard to imagine that a problem that has plagued the field of theoretical computer science for decades has been solved just like that."

After calming down, Jiang Huanxi leaned on Xu Qingshan's shoulder and spoke softly.

“It’s just a small problem.”

Xu Qingshan uploaded it to arXiv according to the process.

"And the paper is only six pages long, and the core proof is only two pages long. Just like you said, it can be directly condensed into a formula in a microblog. It's really amazing."

Jiang Huanxi hugged Xu Qingshan's strong arms. Although Xu Qingshan's arms moved a little when he was typing on the keyboard, Jiang Huanxi felt particularly at ease.

“The truth in the world is often very simple.”

Xu Qingshan finished uploading, turned his head and said.

"Although this is a conjecture in the computer field, the core breakthrough is mathematics."

"Well, the beauty of mathematics is more extreme than I imagined. This should be considered applied mathematics, right?"

"To be precise, it can be considered computational science, and it is one of the most perfect applications of mathematics in the computer field."

"Then I really want to go down the path of combining application and mathematics. I think I will really like it."

"it is good."

Xu Qingshan affirmed firmly.

Jiang Huanxi tightened his arms again.

It's snowing outside the window.

Xue Man didn't come into the house.

But in this early winter, among the pre-reviewed papers on arXiv, there is one more paper waiting to be discovered by the right person, a paper that will make people feel that the author is brilliant.

"Induced subgraphs of hypercubes and a proof of the Sensitivity Conjecture"

Proof of the sensitivity conjecture for Boolean functions.

Xu Qingshan was not stingy in giving the title.

He generously gave them two.

Compared with their role in the paper, this can indeed be considered generous.

As for whether such a division will weaken Xu Qingshan’s influence?

Not will.

Not to mention that Xu Qingshan himself does not need this paper, even though this paper has a considerable influence in the field of computer science.

Judging from the research team’s resume, insiders know that this paper was definitely led by Xu Qingshan.

Because he is the only one who has the experience of attending ICML.

From the very beginning, Xu Qingshan didn't want to be stingy with his research results to these two girls.

after all.

Feed the cattle and horses first, then you won’t have to worry about them not being able to run!

(End of this chapter)