Chapter 258 The snipe and the clam compete for the fisherman’s profit Another two days passed, and in the living room, Xu Qingzhou was still working on the calculation of Polignac's conjecture. He found a new method and planned to try it using the solution set. First, for the screening of basic prime numbers, he planned to use an infinite sequence such as y=10n+a, which has the properties of an arithmetic sequence and can obtain almost all prime numbers. Then a and 10 are coprime, so the prime numbers 2 and 5 are excluded. Mainstream mathematicians often study mathematics from two aspects. The first can be called "numbers", 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. Xu Qingzhou's experimental method is a little special. He organizes the operation symbols into sets of operation symbols and then establishes a system based on the sets of operation symbols. Outside the window, it was a hot summer day, the sun was shining brightly, beams of light shone in through the window, the cat, the halo, the drooping fan, the TV, the coffee table, everything seemed very peaceful. On the corner of the table, there are two mugs, one pink and one green. They are birthday gifts from School Beauty Song, porcelain mugs she made herself. There were two cartoon figures drawn crookedly on it, which looked a bit abstract. Next to them were the names "Xu Qingzhou" and "Song Yao" written in neat small characters. It was obvious that School Beauty Song had been working very hard on the painting. Xu Qingzhou took a sip of water, tapped 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 there are fewer cases {q=2, 3} or {q=3, 5, 7} or {q=2, 3, 5, 7}. This parity symmetry is a necessary condition for the generation of prime numbers. In the case of twin primes, they are also projected into a combination of 2p+1 and 2p-1 according to the parity symmetry. Looking at this parity symmetry from the source of the sieving method, first all even numbers are sifted out when modulo 2, and then all odd composite numbers are sifted out when modulo 3, 5, and 7. The subsequent module length q will be affected by the previous module length q. Seems to work. At the same time, students majoring in economics in Science and Education 403 are taking advanced mathematics exams. For everyone, advanced mathematics can be summed up in one word: difficult. Only 30 minutes into the exam, Zhang Qiong was stumped by a question that combined integrals and series. so hard. Zhang Qiong put down the pen temporarily and looked up at the good-looking figure on the left. Song Yao was lowering his head and writing something quickly without any pause. It was so fluent. She remembered that Xiaoyao had already taught herself advanced mathematics and had even started learning intermediate microeconomics. Having a roommate like this is really stressful. "Whoo~" Zhang Qiong let out a breath, held her breath, and focused her attention on the test paper again. Time passed, the sun was bright, the sunlight filtered through the leaves, leaving mottled spots of light on the lawn, and a breeze blew through, lifting the white curtains. Just as everyone was writing furiously, there was suddenly a sound of someone standing up from a chair in the classroom. Hearing this voice, Zhang Qiong calculated while muttering to himself: OK, the first person to give up is here. She just looked at the watch and saw that only 30 minutes had passed. Now, it was only 35 minutes in total. Normally, at this time, she wouldn't even have finished half of the work. After writing the last symbol, Zhang Qiong looked up, wanting to see who was the first person to give up in this exam, Tian Haifeng? Or Wang Jianxin? The next moment, her expression was as if she had been struck by lightning, and she stared blankly at the familiar figure on the podium.
Xiaoyao? ! No, Xiaoyao handed in the paper early? Like Zhang Qiong, most people didn’t react in time, and the first person to hand in the paper was actually Song Yao. The major was first, and the old professor who was invigilating the exam was of course familiar with it. He asked with a smile, "Want to check it?" "No." Song Yao shook her head slightly, handed in the paper, and left with her white schoolbag. The old professor is holding the test paper. After finishing them all, he turned his attention to 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 he and Xu Qingzhou from the School of Mathematics are a couple? The old professor couldn't help but chuckle. "Your Mathematics Department and Physics Department were fighting over this, but I didn't expect that the person had already been lured over by our Economics Department." Hey. Two dogs fight, play off. In the classroom, everyone felt terrible when they saw Song Yao handing in her paper 35 minutes before the start of the exam. That girl is still so shining. Liang Dongni exhaled slowly, with a bitter look on her face. It's only been a year since she entered the school, and the gap is so big. Moreover, that boy was also very dazzling. If we were to say who feels the most uncomfortable, it would probably be Tang Yawei, who was originally ranked second. In the exams last semester, she said that she would catch up this semester and narrow the gap. Can. There are two situations now. Song Yao hadn't finished her work and had something urgent to do, so she left immediately. Or, you may be absolutely confident that you can finish the procedure in 35 minutes without even having to check. Ninety-nine percent of the time it's the latter. Zhang Qiong sighed inwardly. It was said in the past that Xu Qingzhou would hand in his paper in thirty or forty minutes during exams, and now Xiaoyao was doing the same. How could this couple live like this? However, she looked strange and always felt that Xiaoyao was a little different. She even walked a little faster than usual. "Ahem~" The old professor coughed lightly to remind everyone to concentrate on the exam. Everyone came back to their senses, quickly put aside other thoughts and concentrated on the exam. Yandong Garden. squeak~ After 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 look of surprise in his eyes. He glanced at the time on the computer and was surprised: "At this time, you should be taking an exam, right?" "I handed in the paper early." Song Yao put her arms 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."
"Yeah, it's my boyfriend's birthday, but he's left alone at home. Shouldn't I give him some compensation?" Xu Qingzhou sighed and pretended to be sad. Song Yao snorted. This guy is the best at taking advantage of others. She hooked Xu Qingzhou's earlobe with her finger and asked, "What compensation do you want?" Xu Qingzhou pulled Song Yao over and held her on his lap, "I want to go to your room to cool off." "." This guy has not changed his evil intentions. Song Yao rested her chin on his shoulder, closed her eyes and enjoyed the peace after her brain had been working at high speed: "Change one." It took a lot of effort to finish a 35-hour test in 2 minutes, and I still have to compensate for it. Song Yao waited for a long time but didn't hear Xu Qingzhou speak. Instead, she found that he was numb to her neck. His hot breath sprayed on her skin, making her feel numb and tingling. She couldn't help but shrink her neck. "Just a kiss and a hug like this is good enough." Xu Qingzhou smelled the faint scent of shampoo and the unique fragrance of girls in Song Yao's hair. Although he said this, he was already thinking: "It's been brewing for so many days, it's time to step up the intensity of the school beauty Song." Too late and things will change. Besides, only the crying child gets the milk. Song Yao patted Xu Qingzhou on the face, arched her body back, leaned her back on his chest, looked out the window, and thought that she should call Aunt Jia and ask her to install an air conditioner to cool down her boyfriend. (End of this chapter)