Li Yu really didn't expect that Einstein would take the initiative to send him a telegram, so he quickly started reading:
"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 heard of me, but I have read reports 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.
I have the intention of getting acquainted, so I sent this telegram. If possible, I hope to discuss some issues that I am thinking about with you."
Boy, 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 sides quite hard.
Fortunately, Li Yu also knows a lot about these things. 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 knowledge 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, only the application of some field equations.
Of course, field equations are also the core theory of general phase theory.
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 they 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 spaces, topological spaces, and elliptic integrals, etc.
Wait...it's really hard to explode.
The solutions to differential equations are fundamentally different under different boundary conditions, and they are completely different. Even the results obtained by circular boundaries and rectangular boundaries are completely different.
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. Basically, everyone who has studied high school physics knows about the mass-energy equation, time slowing down, the shrinkage effect, etc.
Of course, the thoughts contained in it are relatively profound.
Li Yu couldn't say too much at once, so he politely replied with a brief telegram of greetings:
"Dear Mr. Einstein. I also look forward to communicating with you. You and I are of the same age, so we can have in-depth discussions on mathematical sciences!"
Li Yu immediately gave the telegram to Fengling: "Send it out quickly!"
I feel that this telegraph machine is really worth buying. It is not only convenient, but also much cheaper than commercial quotations.
Although it is not as good as later generations of email, it is already the current speed limit.
Seeing that there was a new task so soon, Fengling immediately became energetic and said, "Leave it to me... Hey, wait! Sir, I see that there are no Chinese characters on the code table. How do I type this? How about you teach me?"
"Well," 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 more commonly used.
Or maybe Einstein didn't know that Li Yu could speak German.
Li Yu handed the translated message to Fengling: "That's it."
Then just wait patiently and you will probably receive a reply within a day.
Li Yu took advantage of the opportunity to find Yu Deling and gave her the thick manuscript of "Star Wars".
Yu Deling looked at the manuscript and said in surprise: "Novel? Why did you write this?"
Li Yu smiled and said: "I co-created this, it's a science fiction theme, I'm planning to invest it abroad, but my translation skills are average, after thinking about it, you are the only one who is suitable."
"Interesting!" Yu Deling took the manuscript, "I didn't expect your regular script to be so delicate."
Li Yu said awkwardly: "This is the handwriting of Lu Bicheng, a talented girl from Tianjin who is very popular recently. Didn't I just say co-creation? The other person is him."
Yudeling was quite cheerful: "No problem, you are the one who saved my life, this little thing is nothing. 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 have promised you, I can't go back on it."
Li Yu asked Zhao Qian to bring over three typewriters, and then said: "To facilitate your work, I specially give you three good things."
Yu Deling pursed her lips and smiled and said: "You are really thoughtful."
Li Yu said proudly: "Of course, it will improve efficiency!"
It took a lot of effort to transport these three big treasures. When I wanted to pull things, the rickshaw was 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 energetic: "Am I going to be promoted 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."
Carriage drivers are no different than rickshaw drivers. In the late Qing Dynasty and the early Republic of China, horse carriage drivers were definitely a skilled job. Not everyone could handle it, and they also earned much more money than rickshaw drivers.
The key point is that the carriage driver is not that tired and is relatively respectable - at this time, only ordinary people can afford a carriage.
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 importing it together with the car in the future.
Buying a carriage was easier. When they came to the horse market outside Nancheng, Li Yu spotted a tall horse at a glance and asked, "Seller, how can I sell this horse?"
The shopkeeper noticed that Li Yu was dressed unusually and immediately came up to him and said, "Your Majesty, you have really good taste! 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 most famous horses in China.
The Three-Hippo horse had almost just been 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 "BMW" of horses, and at least it was at the level of BMW's high-end performance cars, the 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? Please tell the store the honest price."
The store owner held out six fingers: "It's not easy to transport this horse. It will cost at least 600 taels."
Li Yu bargained and said, "It's too expensive. I sincerely buy it. How about 500 taels?"
The shopkeeper shook his head: "This is the treasure in my shop. Sir, please take a good look at the teeth, the hooves and the color of the coat. If you ride it, you will be the most ostentatious young man in the capital!"
Although Li Yu didn't know much about bargaining, he knew the basic principles, so he said, "Then I'll go to other places first."
The store owner said very harshly: "You go ahead!"
Li Yu turned his head directly. As soon as he took two steps, the store owner stopped him: "My guest, please stay! I think your 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 the saddle must be complete."
An ordinary Mongolian horse costs about ten taels of silver. The shopkeeper thought about it and said, "Okay, I'll do as you say!"
Sanhe horses are so expensive, so of course they are not used to pull carriages, but to be ridden by oneself, while 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 are in the habit of raising good horses. Many families even regard the quality of horses as the "appearance" of their mansions and compete with each other.
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 300,000 to 400,000 yuan is also described as a "street car."
Forget it, not to mention this, Li Yu himself also fell into the urge to buy famous horses.
The shopkeeper was very discerning and said, "My guest bought a good horse and an ordinary horse. Do you also need to buy a carriage?"
Li Yu asked: "Why, you also have this?"
The shopkeeper said: "Of course, sir, you just come to my house. I have all the stuff in the whole horse market. If you are using it for your own home, from high-end to regular, there are long-shaft carts, large-saddle carts, and small-saddle carts."
Li Yu had driven a carriage once before, and he generally knew that carriages were now divided into levels.
In this sinful feudal society, everything must be classified into grades.
Li Yu asked: "So your family has them?"
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, making it a bit bumpy to sit on, and the carriages are smaller.
. If you want something better, you can use a long-shaft cart, but generally this kind of cart is owned by someone with status."
Zhao Qian, who was standing next to him, interrupted: "I forgot to tell you that my master is the emperor's master!"
"Ouch! You are actually the Emperor's Master!?" The store owner's expression immediately changed, "Young man is too blind to see Taishan, sir, don't blame me!"
Li Yu waved his hand: "It's easy to talk, easy to talk, don't be formal, keep a low profile."
I didn't expect that it would be so easy to reveal this identity.
The store owner pointed to the long driveway: "That's no big deal, you can definitely use it."
Above the long-shaft chariot, there are actually two higher-level chariots: one is the square chariot used exclusively by the royal family, and the other is the red wheel chariot used by the wives of high-ranking officials.