Chapter 340

At home, Xu Qingzhou played games with Guo Ziyang in the morning and stayed home doing calculations until 5:00 PM, when he slowly went out to find the three from 101 who had been wailing for days to eat.

Shabu-shabu restaurant.

As soon as Xu Qingzhou entered the private room, Xu Zhengyang squinted and said: "Old Xu, our rule is that those who arrive late must drink three penalty cups first."

"How come I don't know about this rule?" Xu Qingzhou didn't fall for it.

"It was just passed."

"Alright, then shouldn't we count the times you were late before? Old Xu, if I remember correctly, you were the last one the previous few times."

"This was just decided today, the past doesn't count."

"Who says? Old Kong, Old Zhai, and I agreed before. It's fine, you can make up for it tonight. I've calculated for you, you have to drink 9 cups first."

Hearing that Xu Zhengyang had to drink 9 cups, Kong Xianbo got excited: "That's right, that's right, Old Xu, you should drink first. After you finish, Old Xu can drink."

Zhai Ziqiang also nodded.

Xu Zhengyang: "Heh, do you really think I'm stupid? Old Kong, you were 20 minutes late last time, shouldn't that be doubled? Also, Old Zhai, you..."

With that, the three-person alliance instantly disintegrated.

Laughing and chatting, the dishes were all served, and everyone started using their chopsticks.

In freshman year, drinking was usually about chugging, like Xu Zhengyang, who liked to drag people in and wouldn't stop until everyone else was drunk.

Now, drinking seemed to have really become just for fun.

From Xu Qingzhou's experience, after graduating and working, when they gather again, they might drink until they vomit again.

Of course, although they would all be vomiting, the state would be completely different. The former was entirely a youthful mindset, just for fun; the latter might be more about suffering the beatings of society and sighing at the passage of time.

After drinking for a while, everyone soon started talking about future plans.

According to the School of Mathematics' regulations, one could choose a major after this semester ended. Kong Xianbo planned to go into the Mathematics and Applied Mathematics major, Zhai Ziqiang chose Information and Computational Science, and Xu Zhengyang wanted to choose Statistics in the Financial Mathematics department.

Kong Xianbo and Zhai Ziqiang both planned to go to graduate school.

Xu Qingzhou looked at Xu Zhengyang, "Old Xu, what about you?"

"Me?" Xu Zhengyang sighed, his expression worried, "I actually don't really like studying, and I don't have as much drive as you guys. An undergraduate degree is enough."

As he spoke, this guy sighed again: "I'll just go back and inherit the family property, and collect rent when I have nothing to do."

The three of them silently clinked glasses.

Hehe, it's finally my turn to show off, not easy.

Xu Zhengyang also raised his glass and took a sip with the demeanor of a master. This is the confidence of having a courtyard house inside the Second Ring Road.

At 9:00 PM, the group came out of the restaurant and walked slowly on the street. In March, it was still chilly at night.

The first to slip away was Xu Zhengyang, saying he was going to pick up Chen Shiqi.

Xu Qingzhou was the second to leave.

Zhai Ziqiang sighed: "Without realizing it, only the two of us are left."

Ding~

Kong Xianbo's phone sounded with a message notification. He looked down, his expression slightly frozen, and looked up at Zhai Ziqiang: "Old Zhai, I have something to do, I might not be coming back tonight."

"."

On the road, Zhai Ziqiang stood woodenly. At this moment, the light seemed to have left his eyes.

Yandongyuan.

Xu Qingzhou pushed the door and entered. Song Yao had already showered, her smooth long hair draped over her shoulders, revealing two fair, white calves, sitting in front of the computer typing away.

"I'm back."

He hadn't drunk many bottles of wine to begin with, and the little bit of drunkenness had dissipated on the way.

"Mm," Song Yao said without looking back.

Xu Qingzhou was very self-aware, went back to his room to get clean clothes, and went to the bathroom to wash away the smell of alcohol. Showering, drying his hair, by the time Xu Qingzhou put down the hairdryer, the school beauty Song had already started tying her hair, her gaze burning.

Tonight was destined to be another sleepless night.

Xu Qingzhou sighed to himself.

Days passed by, and in the blink of an eye, it was late March.

Song Yao returned from outside and called out to her boyfriend who had been cooped up at home for four days, "Xu Qingzhou, change your clothes, let's go running."

Xu Qingzhou pulled his thoughts away from the complex equations in front of him, nodded, and got up. Having been cooped up at home for so many days, it was time to go out and run a few laps to relax.

Although spring had arrived, he was wrapped up thicker than in February. The heating was turned off, and the temperature in the house dropped all at once.

Er Miao flicked its tail, preparing to pounce on Xu Qingzhou's leg as soon as it found the right moment.

Once the heating was off, its original throne was abandoned, and the warmest place now was on the two-legged beast.

After circling the two-legged beasts a few times, seeing that neither Xu Qingzhou nor Song Yao had any intention of holding it, it meowed twice and went back to its little nest.

(In one look/p>)

The two quickly changed into sportswear.

Before leaving, Song Yao saw that Xu Qingzhou's expression was a bit tired, rubbed his face, and comforted him: "Teacher Xu, not having enough brain cells is not your fault."

"Why do I feel like you're scolding me?"

"No."

"Song Laoshi, are you sure?"

"You are not allowed to call me Song Laoshi!"

During this period, Xu Qingzhou used the bilinear oscillatory integral estimate established by Lee to improve the square function estimate, thereby further improving the local smoothness estimate of Fourier integral operators satisfying the cinematic curvature condition.

His current approach was to convert the square function estimate into an equivalent bilinear form, in order to use the bilinear oscillatory integral estimate.

Everything was going smoothly, but he suddenly got stuck when converting the bilinear terms falling into the same scale into the standard situation appearing in the lemma.

To put it simply, Xu Qingzhou intended to complete a jigsaw puzzle. The lemma completed a few days ago was the pattern that needed to be pieced together. Now, most of the pattern assembly work had been completed.

He had some "bilinear term" fragments in his hand. These fragments were like two small pieces put together, but their size and shape might not perfectly match the desired pattern.

Now, he needed to introduce a tool to scale these fragments, or even change their shape, so that the puzzle could be completed.

The problem was, regarding this tool, Xu Qingzhou was currently at his wit's end. He had used a pile of scratch paper, but still hadn't found a direction.

He held his breath and calculated bitterly for 3 days, then recognized a fact: this time, he was really stuck.

The two went downstairs. The streetlights on both sides were already on. Although it had been a bright sunny day, after night fell, there was still a hint of chill in the air, and both of them tightened their collars.

Song Yao walked in front, her steps light, "Preparing to hard-core the bilinear form problem?"

Xu Qingzhou shook his head and said: "I plan to put this aside for now and tinker with some physics stuff."

If he couldn't do math, he could only go study physics and do some old-school work to find confidence.

"I thought you would grind it out."

"I'm not stupid," Xu Qingzhou curled his lips. After coming out, he felt completely relaxed, "Knowing that I can't... pfft, I mean, knowing that I'm stuck and still stubbornly charging forward."

"You admit you can't do it."

"."

Xu Qingzhou viewed this as a provocation.

However, the school beauty Song clearly belonged to the type who was bad at it but loved to play.

(End of chapter)