Chapter 379

February 8th, Friday.

The capital had its first snow after the New Year. Outside the window, heavy snow was falling. Everywhere the eye could see was a vast expanse of white, and one could vaguely see some figures walking by.

"This might be the last snow of the first half of the year."

"Damn, I must have been infected by Song Yao, actually running outside to freeze like an idiot."

Xu Qingzhou muttered, turned back into the house, went to the kitchen to check the pork rib soup he was stewing, and seeing that the time was about right, put on an apron to prepare to stir-fry dishes.

Twenty minutes passed.

At the doorway, two girls stomped their feet, shook off the snow particles on their bodies, and entered the house.

Zhang Qiong rubbed her hands. "Whoo~ so cold... Xiao Yao, the heating here is much warmer than in the dormitory."

Just as she was speaking, half a body poked out from the kitchen; it was Xu Qingzhou.

"You guys sit for a while first." Xu Qingzhou raised the ladle.

"Oh oh, okay." Although it was the second time Zhang Qiong saw Xu Qingzhou in this "househusband" state, she still had a strange feeling.

The contrast with the internet is too big.

Super academic god and househusband... completely incompatible.

Zhang Qiong was a bit envious; she felt this environment was too warm, and it even felt a bit like home.

"Sit first." Song Yao walked over to look at the kitchen, and seeing that Xu Qingzhou was already stir-frying, she poured a cup of hot water for Zhang Qiong first.

"Er Miao~"

Girls might really have no resistance to furry things. Zhang Qiong held the cup to warm her hands and ran over to tease Er Miao.

Er Miao drooped its head, looked down on the two-legged beast poking it with its finger, and meowed twice in disgust.

At 6 PM, the three people were already sitting around the dining table.

Four dishes and one soup, with color, fragrance, and taste all complete.

"Better than what we ordered in the Sichuan restaurant." Zhang Qiong nodded in praise.

Xu Qingzhou showed off: "That's for sure, chef-level standard, only this one place, no other branch. If I become unemployed in the future, I'll go open a restaurant."

"This person can't be praised." Song Yao said to Zhang Qiong.

Zhang Qiong smiled and sighed: "I still don't know how to cook."

"Step by step, I didn't know how before either." Song Yao comforted her.

Xu Qingzhou nodded and sighed: "Yeah, even chives and... hiss~"

Someone's foot was heavily stepped on.

"What's wrong with you?" Zhang Qiong looked at Xu Qingzhou in confusion.

Song Yao squinted at Xu Qingzhou.

"Nothing."

Under the threat of death, Xu Qingzhou shook his head, stopped talking nonsense, and asked: "You're planning to continue your graduate studies, right?"

"Yeah, if I don't study, I don't know what to do, so I might as well just keep studying."

Zhang Qiong had no idol baggage, added a second bowl of rice, and nodded.

For those who enter the capital university, graduate school is more about whether they want to study, not whether they can pass the exam. After all, the recommendation rate for graduate school at the capital university has always been 40% to 50%, and in some years it can even reach 60%.

The rest who were not recommended for graduate school also went abroad to study.

Those who actually graduated and worked with a bachelor's degree only accounted for a small part.

Song Yao and Zhang Qiong were in frequent contact and knew her situation very well: "For you, recommendation for graduate school should be no problem."

Zhang Qiong nodded, and sighed with some distress: "Now I'm just struggling with how to choose a supervisor and what direction to take."

"For many people, the graduate school in their imagination should be like this: the research direction has a bright future, the project funding is sufficient, there are one or two horizontal projects to enrich the resume, then a few vertical topics to publish articles and get various scholarships, and the supervisor personally guides the thesis..."

Xu Qingzhou had already finished eating, and after drinking a sip of soup, he analyzed it for Zhang Qiong.

"Yes, yes, yes." Zhang Qiong's eyes lit up.

"But..." Xu Qingzhou paused, spread his hands, and said: "The probability of encountering such a supervisor is not high."

Xu Qingzhou had once studied from a master's degree to a doctorate and had many feelings.

"The first type, the supervisor has already turned to administration and will not personally guide. Usually, there are doctoral seniors and senior sisters to lead. They have mature routines for patents, competitions, articles, scholarships, etc., but there is nothing suitable for finding a job in the country."

"The second type, the supervisor is that kind of senior old professor who focuses on pure academics and does not accept any horizontal topics. They only want doctoral students; for master's students, the hope is not great."

Just like Academician Chu Jiangfeng, now he doesn't even take doctoral students, putting all his energy into scientific research.

"The third type, the supervisor has super many projects, and the students are pure cattle and horses, always having endless work. Of course, this situation is still okay."

Xu Qingzhou leaned on the chair and said lazily.

There are also supervisors who are the directors of a certain research institute, with quite a lot of official authority, who will not care about the life or death of graduate students, and the people under them are anxious even about opening topics.

Or the supervisor is relatively young, the usual project funding is insufficient, and the achievements are few. The advantage is that they are serious, personally guide every step, and can even modify the thesis word by word for you.

Or the supervisor is an associate professor who has no pursuit, teaching in a Buddhist style, and can even get along with students, and achievements depend on the students themselves.

Of course, everything is relative. For example, the point of insufficient funding, the insufficient funding of a certain research group at the capital university is simply much more than that of some bottom-tier universities.

"Hmm, I've noted it down, I will consider it seriously." Zhang Qiong nodded. She hadn't thought about studying for a graduate degree under a big shot in a certain field like Li Daiyue or under an academician-level supervisor like Xu Qingzhou and the others.

Being able to get a recommendation quota for graduate school in August or September would be satisfying enough.

It's not that she is degenerate, but it is super, super difficult.

Wanting to enter top institutions like the capital university and Shuimu University really requires IQ. Then, there will be a kind of being rubbed on the ground, realizing what is called a gap.

That's right, the more top-tier the institution, the more obvious the IQ gap.

The three people finished eating, let Song Yao and Zhang Qiong chat, and Xu Qingzhou took the initiative to undertake the task of washing dishes.

Zhang Qiong clicked her tongue. "Xiao Yao, your life is too enviable."

Song Yao: "You can find one too."

"No chance."

Zhang Qiong said miserably: "In freshman and sophomore year, it was still possible. This is already the second semester of junior year... I now wish I could use 24 hours to read books, where would I have the energy to date."

After a pause, she laughed instead, propping her chin, and said: "Besides, dating yourself is not as beautiful as watching you two date."

"Dating yourself is still very beautiful." Song Yao's gaze looked towards the direction of the kitchen. In winter, being able to hide in the warm covers together is much more comfortable than sleeping alone before.

"When I have nothing to do, I come here to eat some dog food and I'm satisfied. Dating or whatever, wait until graduate school to see."

Zhang Qiong also glanced at the kitchen: "Your Xu Qingzhou is so virtuous."

As soon as she thought about secretly following Xu Qingzhou in the past, wanting to steal evidence of his "cheating," she felt it was funny.

"Virtuous..." Song Yao sighed in her heart. Virtuous, tonight it all has to be paid back. This guy took care of her for several days, and it was hard to wait until tonight...

Song Xiaohua felt worried in her heart.

Zhang Qiong stayed until 8 PM and then said goodbye and left.

Song Yao sent Zhang Qiong away and came back, leaned on the sofa, put her feet into Xu Qingzhou's arms, and rubbed her white-socked feet on his legs. "What you like, original flavor."

"."

"I'm not a pervert."

"I know... hmm, lighter, a bit itchy..."

It was still early, and the two of them sat to digest their food.

Xu Qingzhou pulled at Song Xiaohua's feet, a bit bored, and simply opened Weibo.

2.6 million fans, the comment section and private messages were quite lively.

"Academic God Xu, time to come out and act cool." "As deep as the sea in harmonic analysis, looking forward to Academic God Xu creating brilliance in the field of harmonic analysis again."

"Really, every time I'm desperate when writing a thesis, I flip through Academic God Xu's Weibo to take a look, and then I'm even more desperate."

"I think everyone should stop looking forward to it, look at what this is."

Someone posted a photo, Xu Qingzhou clicked it open, it was actually the thesis of the model he helped Professor Zhao Shengwen and the others make last time.

"Discovered it when looking at the thesis yesterday, Academic God Xu made another physics SCI, definitely no time to study anything about harmonic analysis."

"Damn, what a coincidence. Look at this again."

Another screenshot.

"I, a graduate student in the field of economics, can even see Academic God Xu's thesis, it's outrageous. ARIMA model, you don't know, my boss was directly depressed. Just established the project, led the team to fight for two months, and as a result, a bolt from the blue came from Xu Qingzhou's side."

"Damn, physics I know, how did Academic God Xu run to the field of economics again???"

"Don't ask, just shout 'awesome'."

Please... you... collect_()

"Academic God Xu: Hey, I'm just playing."

"I seem to understand a truth, Academic God Xu is doing everything, just not doing harmonic analysis."

"Predicting one hand, harmonic analysis can't go on."

"Normal, after all, it's completely different from the field Academic God Xu studied before."

"Not necessarily, that's all for ordinary people. Is Academic God Xu human? No."

Xu Qingzhou's expression was strange, always feeling... this person is scolding himself.

"I'll just say it, if this can also come up with some new tricks, I'll eat shit while doing a handstand."

Xu Qingzhou couldn't help but be happy. People on the internet are indeed talented. After aiming at Weibo for a while, he also put away his phone, pinched Song Yao's feet, and said: "Time to take a shower."

"You... you go yourself."

Song Yao already knew what this guy wanted to do. In the bathroom or whatever, it's too messy, can't satisfy this person's bad taste.

"Alright."

Xu Qingzhou shrugged and said.

This actually made Song Yao stunned for a moment; this guy changed his nature.

However, when Xu Qingzhou pounced over and hugged her whole body, she knew.

"Xu Qingzhou, let me go!"

"Xu Qingzhou!"

The next day.

At 10 AM, the two of them climbed out of bed.

Song Yao gargled and said: "Auntie Wang sent us some cured meat, remember to go get it later."

"Your mother-in-law-daughter-in-law relationship is too strange." Xu Qingzhou leaned on the bedroom door frame.

"Where..." Song Yao wanted to refute, stared, "How is it a mother-in-law-daughter-in-law relationship?"

Xu Qingzhou shrugged. The mother-in-law-daughter-in-law fight scenes that appeared in TV dramas probably wouldn't happen between Song Yao and Wang Nushi.

Wang Nushi and the others' consistent view is that the older generation should interfere less in the affairs of young people. Usually, when going home, Old Xu and Wang Nushi just ask about him and Song Yao's situation.

They never say what you should do or how you should do it.

As for Song Yao, she wouldn't be like the heroine in a TV drama who seeks death.

Song Xiaohua wore pink long pajamas, her beautiful figure hidden under the wide pajamas, just trembling slightly with the action of washing up.

Xu Qingzhou couldn't help but pinch it, causing Song Xiaohua to chase him and beat him for a long time.

After eating lunch, the two of them were busy with their own affairs.

Xu Qingzhou found an empty seat in the library and devoted himself to calculation.

During the New Year period, he completed the proof of the variable-coefficient version of the square function inequality and began to improve the results on the local smoothness of Mockenhaupt-Seeger-Sogge.

The goal now is also very clear: let {xh)} become a sequence of smooth truncation functions with homogeneity of degree 1 belonging to angular decomposition, hoping to improve the estimation obtained by the best estimation and trivial L estimation in local smoothness.

Once this part of the content is settled, Xu Qingzhou's proof goal is also basically completed.

After the local smoothness research ends, can he challenge the next mathematical problem?

"Wait."

Xu Qingzhou shook his head, sighing that he seemed to be a bit floating. The problem at hand hadn't been settled yet, and he was already thinking about the next challenge topic.

In March, the weather gradually warmed up, and dots of green emerged on the treetops, making the originally desolate environment have more vitality.

Yandong Garden.

In the evening, the setting sun hung on the southwest horizon, and the sunlight fell into the corner of the living room through the glass. Er Miao lay lazily in the sunlight.

In front of the table, Xu Qingzhou's brows were tightly furrowed, and the table in the upper right corner was already covered with abandoned manuscripts.

Mid-February now, more than ten days, Xu Qingzhou was stuck on a formula. Specifically, it was the lack of L^p—L^p estimation of the variable-coefficient Kakeya maximal function in the light cone direction.

The Kakeya maximal function is a variation of the Hardy-Littlewood maximal function.

When p>2, the norm in L^p space is more sensitive to the fluctuations of the function, which means that when estimating the Kakeya maximal function, it is necessary to more accurately control the volatility and extreme value behavior of the function.

"Suppose, first define a simplified function space f."

After pondering for a moment, Xu Qingzhou shook his head again, rubbing his temples, "This won't work..."

Squeak~

Song Yao just came back from school, putting down her schoolbag while saying: "Xu Qingzhou, change clothes, go out for a run."

"Oh, okay."

The person in front of the table answered, but there was no movement.

Song Yao frowned, walked over, hugged him from behind, and twisted his ears, "Teacher Xu~"

"Soon, soon." Xu Qingzhou said.

Song Yao sniffed at Xu Qingzhou's neck, the familiar scent that made one feel comfortable, "If you can't get it out, don't waste time."

"."

"I suspect you're driving."

"It's your thoughts that are dirty." Song Yao wouldn't admit that there was a problem with her words, got up from Xu Qingzhou, went in to change clothes, and prepared the equipment for exercise later, "Oh, by the way, if I see you still sitting when I come out, hmph~"

"."

The two of them put on windproof jackets and went out.

Mid-March, the wind at night still carried some chill. Xu Qingzhou couldn't help but shrink his head, continuing to think about the calculation just now.

Song Yao turned her head to look at her boyfriend who seemed not to have walked out of the calculation, and said: "You said last time you wanted to derive an inequality related to the Kakeya maximal function and L^p norm."

"Yeah, tried it today, it doesn't work." Xu Qingzhou said helplessly.

Song Yao thought for a while and said again: "Different p-values, the subtle special properties of Kakeya sets, approximate calculation or finding the upper and lower bounds of the maximal function... eh, what's wrong with you?"

Song Yao was speaking, but suddenly discovered that Xu Qingzhou stopped abruptly.

Xu Qingzhou said in a deep voice: "You say it like that, I seem to have a bit of an idea again."

In L^p space, studying the estimation of the Kakeya maximal function is to understand the behavioral characteristics of the function on the Kakeya set. If we deduce from certain properties of the Kakeya set, perhaps...

"Seems quite promising..."

Xu Qingzhou nodded slightly, even a bit impatient, "How about you..."

Song Yao walked over, reached out to wrap around Xu Qingzhou's neck, stared at him with crystal-clear eyes, and said in a gentle tone: "In that case, I can't guarantee I won't ram you into the wall."

(End of chapter)