Li Yu really didn't expect that Einstein would take the initiative to send him a telegram, and quickly started to read: "Hello, Mr. Li Yu from the mysterious East, my name is Einstein, and I am an employee of the Swiss Patent Office. You may not have You have heard of me, but I have read about you in various news." Li Yu thought to himself, judging from what you said, how could I not have heard of you.
The telegram added: "I have carefully studied all the articles and papers you wrote, and I admire your husband's attainments in physics and mathematics very much. After all, there are very few people who understand physics and mathematics at the same time. The understanding is so thorough and in-depth, which makes me even more impressed. The idea of getting acquainted arose. So I sent this telegram. If possible, I hope to discuss some issues that I am thinking about with my husband." Good guy, what else can Einstein think about now!
? Isn’t it just special relativity and the photoelectric effect? Strictly speaking, the photoelectric effect can be counted in the field of quantum mechanics, so Einstein is now taking a two-pronged approach, grasping both hands quite hard.
Fortunately, Li Yu also knows these things relatively well. He has learned the special theory of relativity, so it is not too difficult. In fact, it was the special theory of relativity that made Einstein famous. After all, this thing is so subversive to everyone's understanding that it immediately attracts attention; secondly, it is relatively easy to understand, and the Lorentz transformation used can still be used by people with some mathematical foundation. Understandable.
As for the general theory of relativity that later truly established Einstein's supremacy, Li Yu didn't know much about it. He only knew the application of some field equations.
Of course, field equations are also the core theory of general phase. The field equation of general relativity is a tensor equation with 10 unknown quantities. To be precise, it is a second-order nonlinear partial differential equation system composed of 10 equations.
As mentioned before, differential equations are very difficult. There is no general solution and can only be solved violently. Being able to solve a solution to the field equation is an incredible achievement. In fact, a black hole is just a solution to the field equation.
One more thing, solving differential equations often involves boundary problems, initial conditions, a lot of settings, and the use of various theorems, and also requires the use of high-latitude space, topological space, and elliptic integrals, etc. Wait...it's really hard to explode.
The solutions of differential equations under different boundary conditions are fundamentally different, and they are completely different.
Even circular borders and rectangular borders produce completely different results. To put it simply, this thing is difficult.
Differential equations are not simple, and are all studied by top mathematicians. Anyway, when Li Yu took the course "Methods of Mathematical Physics" that specialized in differential equations, it was really painful. At one point, he felt like he was listening to a book from heaven.
But the special theory of relativity is much more amiable compared to it. It is all about mass-energy equations, time slowing down, scale shrinkage effects, etc. Basically everyone who has studied high school physics knows it.
Of course, the thoughts contained in it are relatively profound. Li Yu couldn't talk too much at once, so he politely replied with a short greeting telegram: "Dear Mr. Einstein. I also look forward to communicating with you. You and I are of the same age, so we can talk about mathematics and science." Let’s have an in-depth scientific discussion!” Li Yu immediately gave the telegram to Fengling: “Send it out quickly!” I felt that this telegraph machine was really worth buying. It was not only convenient, but also much cheaper than the commercial quotation.
Although it is not as good as later generations of email, it is already the current speed limit. Fengling immediately brightened up when she saw a new task coming so soon.
"Leave it to me... Hey, wait! Sir, I see there are no Chinese characters on the code table. How do I type this? How about you teach me?"
"Uh," Li Yu realized that he was too anxious.
"It was my negligence. I will translate it into English for you." Einstein is now in Switzerland, but at this time, there are no science and engineering students who don't understand English, and they even know many languages.
Moreover, the sun is still in the stage where the sun never sets on Great Britain, and English has indeed become relatively common. Or maybe Einstein didn't know that Li Yu could speak German.
Li Yu handed the translated message to Fengling: "That's it." Then he waited patiently, and he expected to receive a reply within a day.
Li Yu took advantage of the opportunity to find Yu Deling and gave her the thick "Star Wars" manuscript. Yu Deling looked at the manuscript and asked in surprise: "?Why did you write this?" Li Yu smiled and said: "I co-created it with a science fiction theme. I plan to also export it abroad, but my translation skills are average. So, after thinking about it, you are the only one who is suitable."
"Interesting!" Yu Deling took the manuscript and said
"I didn't expect your regular script to be so delicate." Li Yu said awkwardly: "This is the handwriting of Lv Bicheng, a talented girl from Tianjin who is very popular recently. Didn't I just say that he was co-created? The other person is him." Yu Deling said happily: "No problem, you He is the person who saved my life. This trivial matter is insignificant. Tell me, which language do you want to translate it into?" Li Yu said shamelessly: "Translate it into English first, and then it is best to translate it into French and German. "
"Why so many versions?" Yu Deling asked puzzledly.
"Because I think it would be good to distribute it in more countries." Li Yu said. This workload is not small. Yu Deling smiled and said: "Well, since I promised you, I can't go back on it." Li Yu asked Zhao Qian to bring over three typewriters, and then said: "In order to facilitate your work, I specially give you three typewriters." Good stuff." Yu Deling pursed his lips and said with a smile: "You are really thoughtful." Li Yu said proudly: "Of course, to improve efficiency!" It took a lot of effort to transport these three big treasures. When I want to pull something, the rickshaw is really weak.
After bidding farewell to De Ling, Li Yu said to Zhao Qian: "Let's go to the horse market to buy two horses and a carriage." Zhao Qian suddenly became more energetic: "Am I going to be upgraded to a coachman in the future?" Li Yu got on the rickshaw: "Of course, I told you a long time ago that it is impossible for you to be a rickshaw puller for the rest of your life." A rickshaw puller is no better than a rickshaw puller. In the late Qing Dynasty and the early Republic of China, a rickshaw puller was definitely a skilled job, and not everyone could do it. You can do it, and you can make much more money than a rickshaw driver.
The key point is that the carriage driver is not that tired and is relatively respectable - not ordinary people can afford a carriage at this time.
Li Yu originally wanted to buy a bicycle, but it needed to be purely imported, which was troublesome, so he had to save it for later importing it together with the car.
Buying a carriage was easier. When they came to the horse market outside Nancheng, Li Yu spotted a tall horse at a glance. He stepped forward and asked, "Seller, how do you sell this horse?" The shopkeeper saw that Li Yu was dressed unusually, and asked He immediately came up to him and said, "Your Majesty, your taste is really good! This is my best horse. I just brought it from Heilongjiang. It is a top-quality Sanhe horse." Well, no wonder Li Yu looks so good and is one of the three famous horses in China. One of the horses.
The Three-Hippo horse was almost newly bred at this time. It has a handsome body, good strength and speed, good endurance, and brisk footsteps. It has many advantages.
Among the available horse racing records, Sanhe Horse is the only domestic horse that can compete with famous foreign horses. At the beginning of the 20th century, Sanhema was definitely the most popular among horses.
"BMW", and at least the level of BMW's high-end performance car M series. The more Li Yu saw it, the more he liked it. It was much taller and more powerful than the ordinary Mongolian horse he rode in the Beiyang Army.
"How much is it? Store, tell me the honest price." The store held out six fingers: "It's not easy to transport this horse. It costs at least 600 taels." Li Yu bargained and said: "It's too expensive. I sincerely buy it. , how about 500 taels?" The store owner shook his head: "This is the treasure in my store. Sir, please take a good look at the teeth, hooves and coat color. If you ride out, you will be the most ostentatious young master in the capital!" Although Li Yu is not very good at it, He knew how to bargain, but he also knew some basic principles, so he said, "Then I'll go to another store first." The store owner said harshly: "Go ahead!" Li Yu turned around directly, and after taking two steps, the store owner stopped him. : "The guest stays! I think the guest is also destined, so I will suffer a loss. How about 550 taels?" Li Yu said: "550 taels is fine, but you have to give me another ordinary Mongolian horse, and I need a saddle." Everything." An ordinary Mongolian horse costs about ten taels of silver. The shopkeeper thought for a while and said, "Okay, just as you said!" The Sanhe horse is so expensive. Of course, it is not used to pull carriages, but to ride on it. Mongolian horses can be used to pull carriages.
In fact, the Han people have not had a tradition of riding horses since ancient times. But now there are many banner people in Beijing, and they have the custom of raising good horses. Many families even regard the quality of horses as the basis of their residences.
"Facade", competing for comparison. Speaking of which, this comparison mentality seems to be no different from that of later generations. Otherwise, a horse with more than a dozen taels of silver would be enough. Who would spend money to buy a famous horse that costs hundreds or even thousands of taels.
In Li Yu's previous life, there were also many people who bought cars for the sake of face, and even formed a somewhat abnormal view on car consumption: face is the key factor in choosing a car.
This is not the most terrifying thing. What is even more terrifying is that in some media and other media, a BBA worth three to four hundred thousand is also said to be
"Street Car". Forget it, not to mention this, Li Yu himself also fell into the urge to buy famous horses.
The store owner was very discerning and said, "My guest has bought both a good horse and an ordinary horse. Do you also need to buy a carriage?" Li Yu asked, "Why, do you have this too?" The store owner said, "Of course you do. Come to my house, my guest." That's right, I have all the stuff in the entire horse market. If the guest is for his own use, from high-end to regular, there are long-shaft carts, large-saddle carts, and small-saddle carts." Li Yu had driven a horse-drawn carriage once before, and he generally knew that the same applies to horse-drawn carriages now. Graded.
In this sinful feudal society, everything must be classified. Li Yu asked: "So you have them at home?" The shopkeeper said: "Of course, it depends on your status as a guest. Generally, the best-selling ones are large saddle cars and small saddle cars, but these cars have wheels in the middle of the carriage. It's a bit bumpy to sit on, and the carriage is a little smaller. If you're better, you can use a long-column carriage, but generally this kind of carriage is owned by a distinguished family." Zhao Qian next to him interjected: "I forgot to tell you, my master He is the emperor’s master!”
"Ouch! You are actually the Emperor's Master!?" The store owner's expression immediately changed.
"You are too young to see Taishan, sir, don't blame me!" Li Yu waved his hand: "It's easy to talk, don't be formal, keep a low profile." I didn't expect that this identity would be so easy to express.
The store owner pointed to the long-axis carriage and said, "That's no big deal. You can definitely use it." Above the long-axis carriage, there are actually two higher-level cars: one is a square carriage specially used for the royal family, and the other is a square carriage specially used for the royal family. It is the Zhu Lun Chao used by the wives of high-ranking officials.
