Chapter 258 The clams fight and the fisherman wins
Another two days have passed. In the living room, Xu Qingzhou is still making calculations on the Polignac conjecture. He has found a new method and plans to try to use the solution set. Once done.
First of all, for the screening of basic prime numbers, he planned to use an infinite sequence like y=10n+a, so that it not only has the properties of an arithmetic sequence, but also can find almost all prime numbers, then a and 10 are relatively prime, so the prime numbers 2 and 5 are excluded.
Mainstream mathematicians often study mathematics from two aspects. The first one can be called "number", that is, starting from fields such as number theory, function theory, functional analysis, etc.
The second type can be called "shape", which studies mathematics from geometry, topology, etc.
Using these two methods, various operation symbols and techniques are introduced.
The method of Xu Qingzhou's experiment is a little more special. He combined the operation symbols into a set of operation symbols and established a system based on the set of operation symbols.
Outside the window, the summer is scorching, the sun is just right outside, the light beams shine in from the window, the cat, the halo, the drooping fan, the TV, the coffee table, everything looks very peaceful.
On the corner of the table, there are two more mugs, one pink and one cyan. They are birthday gifts from the school belle of Song Dynasty. They are porcelain made by themselves.
There are two cartoon figures drawn crookedly on it, which is a bit abstract. The names of "Xu Qingzhou" and "Song Yao" are written in delicate small characters next to them. It can be seen that the school beauty Song has worked very hard on the drawing.
Xu Qingzhou took a sip of water, tapped the tip of his pen, and was thinking about how to take the next steps.
If we look at the allowed set {0, 2} or {0, 4}, we find that {q=2, 3} or {q=3, 5, 7} or {q=2 is missing, 3, 5, 7}, this odd-even symmetry is a necessary condition for the generation of prime numbers.
The case of twin prime numbers is also projected into a combination of 2p+1 and 2p-1 according to odd-even symmetry.
Looking at this odd-even symmetry from the source of the sieve method, first all even numbers are screened out in modulo 2, and then all odd and summed numbers are screened out in modulo 3, 5, and 7. The following modules are long q will be affected by the previous module length q.
Seems to work.
At the same time, students majoring in Science and Education 403 and Economics are taking the advanced mathematics exam.
High mathematics, for everyone, can be summed up in one word: difficult.
Only 30 minutes had passed since the exam, and Zhang Qiong was stumped by a question that combined integral points and series.
It’s so difficult.
Zhang Qiong temporarily put down the pen and looked up at the handsome figure on the left. Song Yao was lowering her head and writing something without any pause. It was called smooth.
She remembered that Xiaoyao had already taught herself advanced mathematics and even started to learn intermediate microeconomics.
Having such a roommate is so stressful.
“Huh~”
Zhang Qiong breathed out, held her breath and focused on the test paper again.
Time passed, the sun was very bright, the sunlight passed through the leaves, leaving mottled light spots on the lawn, and the draft blew through, raising the white curtains.
Just as everyone was writing furiously, there was a sudden sound in the classroom of someone standing up from their chair.
Hearing this voice, Zhang Qiong calculated and thought in his heart: OK, the first person to mess up is here.
She looked at her watch just now and saw that only 30 minutes had passed. Now she had fully counted, which was 35 minutes. Normally, she would not even finish half of it in this time.
Writing the last symbol, Zhang Qiong looked up, wanting to see who was the first person to mess up in this exam, Tian Haifeng? Or Wang Jianxin?
The next moment, her expression seemed to have been struck by lightning, and she stared blankly at the familiar back on the podium.
Xiaoyao? !
No, Xiaoyao handed in the paper in advance?
Like Zhang Qiong, most of them didn't react. The first person to hand in the paper was actually Song Yao.
The first professional, the old professor who invigilated the exam was of course familiar with it, and asked with a smile: "Don't you want to check?"
"No." Song Yao shook her head slightly, handed in the paper, and carried a white The schoolbag is gone.
The old professor held the test paper.
After finishing everything, he looked at the last two questions.
Well, the answer is correct, the answer is concise, and the logic and steps are clear.
This girl is very nice.
I heard that Xu Qingzhou from Shuyuan is a couple?
The old professor couldn't help but laugh softly. You are fighting back and forth between the Shuyuan and the Wuyuan. Unexpectedly, people have been kidnapped by our Sutras.
Hey.
The snipe and the clam compete for the fisherman’s profit.
In the classroom, everyone looked at Song Yao who handed in the paper 35 minutes before the exam started, and everyone felt bad.
That girl is still so sparkling. Liang Dongni breathed out slowly, with a bitter look on her face. She had only been in school for one year, and the gap was so big.
Moreover, that boy is also very dazzling.
Who is suffering the most is probably Tang Yawei, who was originally ranked second. During the exam last semester, she also said that she would work hard to catch up and narrow the gap this semester.
Yes.
There are two situations now.
Song Yao didn't finish the work and had something urgent to do, so she left directly.
Or, just have absolute confidence that you can finish it in 35 minutes without even checking.
Ninety-nine percent of the time it is the latter.
Zhang Qiong sighed in her heart. In the past, Xu Qingzhou handed in the paper in thirty or forty minutes during the exam. Now Xiaoyao is like this. These two people can't live.
However, she looked strange and always felt that Xiaoyao was a little different and walked a little faster than usual.
"Cough~" The old professor coughed lightly, reminding everyone to concentrate on the exam.
Everyone came back to their senses and quickly put aside other thoughts and concentrated on the exam.
Yandong Garden.
Zhi~
Opening the door, Song Yao hung the parasol and schoolbag on the cabinet at the door.
Xu Qingzhou turned his head and looked at the beautiful girl with a hint of astonishment in his eyes. He glanced at the time on the computer and was surprised: "At this point, you should be taking the exam, right?"
"I handed in the paper in advance. "
Song Yao put her hands around Xu Qingzhou's neck and hugged him from behind, "Today is your birthday. I have exams in the morning and afternoon, so I can't spend time with you. "
"Yes, it's my boyfriend's birthday, but he was left at home alone in an empty room. Do I have to give him some compensation?"
Xu Qingzhou sighed, pretending to be sad.
Song Yao snorted, this guy is the best at climbing along the pole, and hooked Xu Qingzhou's earlobe with his finger, "What compensation do you want?"
Xu Qingzhou pulled Song Yao over and put him on his lap. , "I want to go to your room to enjoy the cool air."
"."
This guy is stubborn.
Song Yao rested her chin on his shoulder, closed her eyes and enjoyed the peace after her brain was running at high speed: "Change."
It took me a lot of effort to finish the 2-hour test paper in 35 minutes, and I still have to make up for it.
Song Yao waited for a long time, but did not hear Xu Qingzhou speak. Instead, she found that this guy was arching on her neck, and his hot breath sprayed on her skin, making it numb and numb, and she couldn't help but shrink. Neck.
“It’s good to kiss and hug like this.”
Xu Qingzhou smelled the faint shampoo fragrance and the unique fragrance of girls in Song Yao’s hair. Although he said this, this Huo Huo was already thinking: "It's been brewing for so many days, it's time to give Song School Beauty some strength."
Changes happened late.
Besides, only children who can cry will get milk.
Song Yao slapped Xu Qingzhou on the face, arched her body backwards, leaned her back on his chest, looked out the window, thinking that she still had to call Aunt Jia and ask her to install an air conditioner. , to cool down the temperature of her boyfriend.
(End of this chapter)