Chapter 258: When the snipe and the clam fight, the fisherman wins

Two more days passed. In the living room, Xu Qingzhou was still calculating Polignac's conjecture. He had found a new method and planned to try using solution sets to tackle it.

First, for the screening of basic prime numbers, he prepared to use an infinite sequence like y=10n+a, so that it would have the properties of an arithmetic progression and could find almost all prime numbers. Since a and 10 are coprime, the primes 2 and 5 were excluded.

Mainstream mathematicians often study mathematics from two aspects. The first can be called "number," that is, starting from fields like number theory, function theory, functional analysis, etc.

The second can be called "shape," studying mathematics from geometry, topology, etc.

Using these two methods, they then introduce various operational symbols and techniques.

Xu Qingzhou's experimental method was slightly more special: he grouped operational symbols into a set of operational symbols and established a system based on this set of operational symbols.

Outside the window, the summer heat was intense, the sun was shining brightly, and light beams shone in through the window. The cat, the halo, the drooping fan, the television, the coffee table—everything seemed very peaceful.

At the corner of the table were two more mugs, one pink and one cyan, birthday gifts from School Beauty Song, porcelain she had made herself.

Like Seeing Zhang Qiong, most people didn't react; the first one to hand in the paper was actually Song Yao.

Read! {

"No." Song Yao shook her head slightly, handed in her paper, and left carrying her white school bag.

"Being able to kiss and hug like this is already very good."

Xiao Yao?! No, wait, Xiao Yao handed in her paper early?

Among them, the case of twin primes was also projected into a combined form of 2p+1 and 2p-1 according to parity symmetry.

Hmm, the answer is correct, the response is concise, and the logic and steps are clear.

"Ahem~" The old professor coughed lightly to remind everyone to focus on the exam.

Ninety-nine percent is the latter.

Seeing Zhang Qiong put down her pen for a moment and looked up at the beautiful figure on the left. Song Yao was lowering her head, writing something rapidly without a pause—it was so smooth.

Or, she just had absolute confidence that she could finish in 35 minutes, without even needing to check.

"Yeah, it's my boyfriend's birthday, and I'm left at home alone. Don't I deserve some compensation?"

If we look at the allowed sets {0, 2} or {0, 4}, we find that the cases of {q=2, 3} or {q=3, 5, 7} or {q=2, 3, 5, 7} are missing. This parity symmetry is a necessary condition for the generation of prime numbers.

"."

In the classroom, everyone looked at Song Yao, who had handed in her paper 35 minutes into the exam, and felt terrible.

Xu Qingzhou sighed, feigning sadness.

Only 30 minutes into the exam, Seeing Zhang Qiong was stumped by a problem combining integrals and series.

!.

Seeing Zhang Qiong let out a breath, held her breath, and focused her attention back on the test paper.

Writing down the last symbol, Seeing Zhang Qiong looked up, wanting to see who the first person to give up on this exam was. Tian Haifeng? Or Wang Jianxin?

Seeing Zhang Qiong sighed in her heart. People used to say Xu Qingzhou would hand in his paper in 30 or 40 minutes during exams, and now Xiao Yao was doing the same. How were other people supposed to live with this couple?

Finishing a 2-hour exam in 35 minutes took a lot of mental effort, and this guy still wanted compensation.

If you had to say who was the most miserable, it might be Tang Yawei, who was originally ranked second. During the last semester's exams, she had said she would catch up this semester and narrow the gap.

It's so hard.

This guy's thieving heart never changes.

The old professor held the test paper.

Xu Qingzhou took a sip of water, his pen tip tapping lightly as he was conceiving how to handle the next steps.

Yandong Garden.

The old professor proctoring the exam was of course familiar with the top student in the major and asked with a smile, "Don't you want to check it?"

However, her expression was strange; she always felt Xiao Yao was a bit different, even walking faster than usual. Song Yao gave a light hum. This guy was best at climbing up the pole; she hooked Xu Qingzhou's earlobe with her finger, "What compensation do you want?"

"Phew~"

Xu Qingzhou turned his head, looking at the beautiful girl. A trace of astonishment appeared in his eyes. He glanced at the computer time and was greatly surprised: "At this hour, you should be taking an exam, right?"

Looking at this parity symmetry from the source of the sieve method, first, all even numbers are screened out at mod 2, then all odd composite numbers are screened out at mod 3, 5, and 7. The subsequent modulus q must all be affected by the preceding modulus q.

Heard they are a couple with that Xu Qingzhou from the Math Academy? The old professor couldn't help but smile lightly. You guys in the Math Academy and Physics Academy fight back and forth, never expected the person to have already been snatched away by our Economics Academy.

"I handed in my paper early."

It seems feasible.

Just as everyone was writing furiously, the sound of someone standing up from a chair suddenly rang out in the classroom.

Everyone came back to their senses, quickly cast aside other thoughts, and focused on the exam.

The next moment, her expression was like she had been struck by lightning; she stared blankly at the familiar back on the podium.

When the snipe and the clam fight, the fisherman wins.

She had checked her watch just now; only 30 minutes had passed. Now, counting everything, it was only 35 minutes. At this time, normally, one wouldn't even be halfway through.

Creak~ Opening the door, Song Yao hung her parasol and school bag on the cabinet at the entrance.

Xu Qingzhou pulled Song Yao over and hugged her onto his lap, "I want to go to your room to cool off."

Song Yao wrapped her arms around Xu Qingzhou's neck, hugging him from behind, "Today is your birthday, and I have exams in the morning and afternoon; I can't properly accompany you."

Finished everything. His gaze turned to the last two problems.

Song Yao rested her chin on his shoulder, closing her eyes to enjoy the peace after her brain had been running at high speed: "Change to another one."

Hearing this sound, Seeing Zhang Qiong, while calculating, muttered in her heart: There, the first person to give up has arrived.

This girl is very good.

At the same time, in Liberal Arts Building 403, Economics students were taking Advanced Mathematics.

But... now there are two situations.

Moreover, that boy is also very dazzling.

She remembered Xiao Yao had already finished self-studying Advanced Mathematics and had even started learning Intermediate Microeconomics.

Hehe.

On it were crookedly drawn two cartoon figures, a bit abstract, and next to them, in delicate small characters, were the names "Xu Qingzhou" and "Song Yao." It could be seen that School Beauty Song had already tried very hard to draw them.

That girl was still shining so brightly. Liang Dongni let out a slow breath, her face showing bitterness. They had only been in school for a year, and the gap was already this big.

Advanced Mathematics, for everyone, can be summarized in one word: difficult.

Song Yao didn't finish; she had some urgent matter, so she left directly.

Song Yao waited for a long time without hearing Xu Qingzhou speak, but instead discovered this guy was rubbing against her neck, his hot breath spraying on her skin, making her feel tingly and numb, and she couldn't help but shrink her neck.

Time passed, the sun was high, and sunlight filtered through the leaves, leaving mottled light spots on the lawn. A draft blew through, lifting the white curtains.

Having such a roommate, the pressure is so great.

Xu Qingzhou smelled the faint shampoo scent in Song Yao's hair and the unique fragrance of a young girl. Although he said that, he was already thinking: "After brewing for so many days, it's time to turn up the intensity for School Beauty Song."

Delay leads to changes.

Besides, the crying child gets the milk.

Song Yao gave Xu Qingzhou a "smack" on the face, arched her body backward, leaned against his chest, and looked out the window, thinking to herself that she still had to call Auntie Jia and ask her to install an air conditioner to cool her boyfriend down.

(End of chapter) ===== CHAPTER 259 =====