Chapter 251 Jiangzhou University's million security target The method adopted by Lu Shan is a method of changing angles, and this is the essence of mathematical argumentation. The original definition of the Dirichlet L function, L(s,χ), is this: The numerator is the value of χ(n), and the denominator is n to the power of s. At this point, we only consider when s is a real number, that is, when s=1, it is not equal to 0. So when s is less than 1, that is, slightly smaller than 1, is it possible that it is equal to 0? No one has ever been able to solve this problem. Only consider the case where L(s, χ) is not equal to 0 - if s is slightly smaller than 1, the denominator is more controllable and c is a constant This conjecture is much weaker than the Riemann hypothesis, at least the Riemann hypothesis for L-functions (the generalized Riemann hypothesis). 广义黎曼猜想是说这个S的实部大于1/2的话不等于0，但就只是很接近1的时候不等于0。 This conjecture is essentially the Landau-Siegel zero problem. The purpose is to prove that such a type of zero point does not exist (especially the real zero point, the imaginary zero point is a little easier) Specifically, for a finite real number sequence χn, how do we prove that it is not non-negative? This means proving that one (at least one) χn is less than 0. So we need to develop a technique to prove that this thing is not equal to 0. This is Lu Shan’s general idea. It is not realistic for Poincare to prove it directly, so he should at least prove it within a certain range. After finishing the thesis, Lu Shan still had some time, so he asked Lin Kai to come to his home to tutor him for a few days and give him some advice on his thinking. "Remember! For any geometry problem, you can't get the answer directly from this figure. You must draw auxiliary lines outside the figure. It doesn't matter what you draw, just draw it, and you will definitely find the solution.
The idea of solving algebraic problems is to change both sides at the same time. Whether it is multiplication or division, you must change it first, and then change the position, and you will find the idea. "Lu Shan highly summarized the idea of solving the problem, which made Lin Kai suddenly enlightened. This is much more powerful than the teacher's summary. "You also need to deduce more on your own and understand it from the root, so that you won't forget it." Lu Shan finished tutoring and returned to school after he had dealt with most of the things at home because something had happened there. Just after the fifteenth day of the first lunar month, Xiaguo Academy of Sciences called Lu Shan and said that the equipment for producing the motherboard was ready and that they would send people to Bansi Company for debugging. Xia Guangming made the call himself. He didn't rest much during the Spring Festival, and neither did his subordinates. But everyone was very enthusiastic and didn't care whether they went home or not. Lu Shan's design drawings inspired many manufacturing links to varying degrees. With such a good learning opportunity, everyone wanted to learn as much as possible. This gave Lu Shan a lot of points. "A new set of equipment can produce 500 to 1000 motherboards a day. If the speed is too fast, the equipment will be worn out and the accuracy may be reduced." The debugger said as he made adjustments. Lu Shan, Zhang Kaifeng and others were already standing nearby. "This number is still a bit small, but it can solve the urgent problem." Lu Shan felt quite regretful. With 500 to 1000 motherboards a day, at most motherboards a year. Xiaguo's demand for laptops is in the tens of millions every year! Even if the current output is added, the annual output is only 600,000 pieces, which is really a bit too little. The debugger looked ashamed. It was not that Xiaguo Academy of Sciences was not capable, but that the things they needed were really difficult to get together, so they could only keep using substitutes to replace the necessary materials. The overall low level of Xiaguo's semiconductor industry was reflected at this moment. Lu Shan knew about this situation and didn't say much. He asked the Xiaguo Academy of Sciences to bring another batch over, on the premise that there would be some improvement in materials science. The outer shell is easier to deal with, but the precision equipment inside is better to use topological semimetal semiconductors as a blueprint to derive components with different performance. When Xiaguo digests Lushan's new materials to a certain extent, it will be able to feed back to the manufacturing level of the manufacturing industry. This cannot be rushed, we have to wait for the industry to spread, just like the blood circulation throughout the body. "How about this, I'll talk to the Academy of Sciences later and have them make two more batches of equipment to ensure production." Lu Shan made a decision. Even if the Xiaguo Academy of Sciences mastered the materials and developed better equipment in the future, it would not matter. He could still upgrade this batch of equipment and it would not be eliminated in a short time. After debugging, Lu Shan and others started experimental production. After a while, they began to change the settings. The debugging master looked nervous. The people at Bansi Company were too careless! What if the modification went wrong? Unexpectedly, before Lu Shan even made any move, Zhang Kaifeng and others had already quickly adjusted the parameters of each link. With just two changes, the parameters were changed and the desired effect was achieved. The people who use the equipment are more familiar with it than the people who make it. There is a natural gap between design and manufacturing! This proves the high level of the BanSi team. Lu Shan has trained this group of people privately to ensure that these senior technical executives can keep up with his pace. When the equipment was officially put into production, Lu Shan felt a little relieved, so he called Xia Guangming to ask how much the help would cost. Unexpectedly, Xia Guangming refused to charge any money. He said that he did not charge any money when Lu Shan provided a solution for the supercomputer last time. How could the Academy of Sciences have the nerve to charge money this time? After the two talked for a while, Lu Shan calmly accepted the kindness of the Xiaguo Academy of Sciences. In essence, it was an exchange of value. If Lu Shan did not have this value, the Academy of Sciences would not help him for free.
Lu Shan was making the final improvements to the paper on Landau-Siegel zero point and would publish it when the time was right. At this time, Chen Qiyi called and said that the school had something that needed Lu Shan's attention. The word "attention" was too serious, so Lu Shan took it to heart and went to see what was going on. It turned out that what happened in the previous two incidents made the school sweat. The first time, they were caught off guard and things were stolen by Tan Ming. The second time, someone was ready to make a move. Fortunately, it did not cause any big problems. It was just that the firewall was easily breached by foreign hackers, which made the school very alert. Therefore, the school plans to carry out security upgrades on the college laboratory servers. If the upgrade is effective, other colleges within Jiangzhou University will follow suit. The purpose of calling Lu Shan over at this juncture was self-evident. Moreover, the principal specifically used the term "sit in charge" and asked Chen Qiyi to inform Lu Shan, which was actually to let Lu Shan check. The meeting that Lu Shan attended was a product briefing, and the main speaker was a network security company, which happened to be 306, the company that even killed computer programs. Li Bo is the general manager of 306 Company, responsible for school-enterprise network security. He brought his team here today to win the order from Jiangzhou University. When the time came, Li Bo immediately began to explain: "Leaders, professors, I am honored to give you a report here..." Li Bo first explained the server security measures in an easy-to-understand manner, and then introduced his company's related products. 306 Company already has a variety of means, such as the firewall system that integrates multiple core technologies of 306 Security Brain to comprehensively respond to border and data center threats. For example, 306 WEB Application Firewall is a new generation of professional WEB application security protection product that can help customers deal with OWASP top10 risks and defend against various web attacks such as web shells, website Trojans, brute force cracking, etc. For example, CDN cloud protection has the function of Web attack protection, which can protect against common web attacks, such as SQL injection attacks, WebShell Trojans, cross-site scripting attacks, command injection attacks, sensitive information leakage, etc. Li Bo talked about many products and gave examples of his company's successful projects. This was a show of strength and technology. It must be said that the 306 is really impressive and is one of the best in Xia. Li Bo also made various promises: "All problems that occur within one year will be solved free of charge, and there is no need to worry! Our company will offer good discounts to university customers, which are more than 10% higher than the discounts offered by ordinary companies!" With such a confident team and such a strong promise, everyone pricked up their ears to listen to the quotation. Li Bo saw that the atmosphere had reached this point, and announced the price. The installation cost of a laboratory was two million! Then he looked at the leaders expectantly. Principal Zhu Yajie was thinking about it, and Dean Zhou Wei was also thinking about whether the offer was reasonable and whether the level of 306 was sufficient. After a few minutes, Zhu Yajie spoke up: "Thank you for Manager Li's explanation. We will make a decision after the meeting." "Okay!" Li Bo naturally knew that such a big thing would not have an immediate result. He gave someone a subtle look and then packed up and left. After seeing the people from 306 leave, Zhu Yajie asked everyone, "What do you think?" "I think it's very good. 306 has the technology and strength, and the quotation is reasonable." Zhao Jing, director of the Logistics Department, spoke first. He is in charge of logistics and is related to materials, so he is in a position to speak appropriately. "I think the price quoted is still too high, at least much higher than the market price. The equipment in some laboratories costs less than 10 million yuan in total." Zhou Wei expressed his attitude directly. The other leaders had different opinions, and for a while everyone was arguing. The reason the director of the logistics department agreed was that good products are not cheap, the 306 is good value for money, other companies are cheaper, but that cannot solve the problem. At this time, Zhu Yajie looked at Lu Shan, and everyone gradually quieted down. "Student Lu Shan, please speak up. Just say whatever you want to say. Don't feel burdened." Zhu Yajie encouraged Lu Shan. Seeing this, Lu Shan could not remain silent: "I think the sources of these technologies of 306 are somewhat complicated. They are all modified based on the security technologies of other countries. Not only can they not play a better role, but they will also lose the original technical characteristics." Having said this, Lu Shan stopped, and Zhu Yajie encouraged him to continue. (End of this chapter)