In a small classroom, he quickly closed the door, opened the window, sat on the podium, and smoked a cigarette.

This series of actions was done in one go, and there was no sense of culture.

This is probably the legendary schoolboy.

Li Zheng's behavior was completely opposite to his. He put away his schoolbag, put away his stationery, straightened his notebook, and sat upright.

Jie Qifen looked at this series of actions and couldn't help but pursed his lips and sighed: "I just need to get a national-level Sanhaosheng for you."

"Ah? Is there a national-level Sanhaosheng?" Li Zheng was inevitably eager to give it a try.

Xie Qifan smiled and said: "Yes, there are all of them, and there are also world-class ones. I will go to Moscow to judge the Lenin Award."

"Boring." Li Zheng thought for a moment and quickly discovered something was wrong, "Isn't that right? Is this an outstanding member you are talking about?"

"...You are really...very serious." Jie Qifen said nothing, lit a cigarette and asked, "Which part of physics do you want to hear? Apart from quantum mechanics, let's talk about it casually."

"Ah? I just want to listen to Quantum." Li Zheng said, picking up the stationery and sitting in the back row of the classroom, so that the smell is smaller.

"Quantum mechanics is just like a pyramid scheme. Those people don't even know what they are doing." Jie Qifen waved his hands resolutely and said, "Hurry up and change it."

"Then let me listen to the field in which you are more specialized." Li Zheng replied.

Jie Qifen waved his hand more resolutely: "No way, you can't understand what I'm doing, and I don't bother to explain it to you until you understand it. Even if you understand it, it won't be of any benefit to your future."

Li Zheng complained: "Why do you have so many things to do in a lecture?"

“I’m going to stop telling you nonsense about perpetual motion machines.”

"No, no, no, no..." Li Zheng scratched his head and said, "Let's talk about fluid mechanics. I'm not very good at this part."

"Normal." Xie Qi said with a cigarette in his mouth, "Do you know Lagrangian description, Euler description, and Bernoulli equation?"

"I know, but not deeply."

"Then let me ask you, what do these three brothers have in common?"

"Well..." Li Zheng replied almost without thinking, "They are all mathematicians."

"Hey, that's right!" He smiled happily at the explanation, lit up his cigarette, jumped off the desk, and walked to the blackboard, "Turn the physical laws into mathematical equations, then cut the fluid into small pieces, and use calculus to solve it.

This is fluid mechanics. Of course, this is just Lagrangian’s method, and Euler’s method is more wild. To put it another way, if you think about it, all physical problems can be solved using this method.”

"Ah." Li Zheng glared, "Isn't this just... Gui Jian Feng?"

"Yes, I heard about him from the School of Mathematics." Xie Qi nodded and said, "His understanding of physics concepts is basically limited to high school textbooks, and he has always turned it into mathematical ideas to solve problems. The School of Mathematics has invited him to go there a long time ago.

I attended, but he just didn’t go much."

"Oh... don't mention him." Li Zheng urged, "You can continue talking."

"Well, let me tell you the Lagrangian description first." Xie Qifen drew a picture on the blackboard, which was probably a pool of water. He cut it into pieces using differential methods, and then drew a series of force diagrams.

"This is the most basic physical image for fluid analysis."

"We need to use physical images as hubs to connect the mathematical world."

"Of course top geniuses don't need this thing. They have a translation system built into their brains."

"For example, von Neumann did this. He also did this, but he did it when he, Fermi and Feynman were building the atomic bomb. When the three brothers worked together to calculate, Fermi was older and used a slide rule, and Feynman

When he was young, he used computers. Von Neumann didn't use anything, he just did mental arithmetic, and the results were always faster than these two old brothers."

"Then the atomic bomb experiment was successful, and the two brothers went home after finishing their work. As a result, von Neumann came up with a 'Neumann stability analysis' while doing mental arithmetic, which directly blossomed mathematics and physics. Unfortunately, they were building the atomic bomb.

I came up with it by the way, and it was kept secret by the military of Magnesia for ten years."

"It's a pity that Lao Feng left when he was in his 50s..."

When Li Zheng heard this, he couldn't help but raise his hand and said: "Teacher Xie, although I rarely listen to cross talk, why do I feel like I'm in Deyun Club?"

"Eh? Do you also listen to Teacher Guo and Teacher Yu? I listen to Chengsu. Do you have that energy in your words?"

"Well...I don't object to this idea, but you said you would only speak for 15 minutes."

"Yes, yes, this time does not count... Look at this fluid, it is three-dimensional. Now let's move slightly in the x direction..."

"Then the y direction, the z direction..."

"The three directions are all put together, which is this big equation. This is the description of the continuity equation."

"With this, if you just put in some physical laws, everything else can be deduced."

"For example, for the speed at a certain moment, you can use the momentum theorem."

"For the first time, I'll take you to wear one first. Actually, it's just these two styles...one piece together and then a little bit..."

"... Finally we have this equation, doesn't it look good?"

"Oh, by the way, this is the Navier-Stokes equation. If you can memorize it, you can use it directly. If you can't memorize it, it doesn't matter. Just push it like I am."

"Sometimes I don't know what to do. There are too many equations, and it's not as comfortable as pushing them out by myself."

"In addition, the momentum theorem does not necessarily apply here. This equation can also be deduced from other physical laws that can construct the relationship between time and speed. You can try it yourself if you have nothing to do. I won't go into it."

"Okay." Jie Qifen threw away the chalk and clapped his hands, "These are the ideas. Now you should be able to derive all the equations of fluid mechanics. Some places require linear algebra. You don't know how to learn it yourself."

Li Zheng: "???"

"Huh? Is there anything else you don't understand?"

"Ah..." Li Zheng trembled and lowered his head.

It's not a question that I don't understand.

I don’t know what I should understand at all!

Li Zheng bit the bullet and asked: "For example... the flow problem of viscous fluid in the tube."

"Isn't it just a matter of putting a tube on it, applying some force, and then it's done?"

"Really... Then let me take a closer look..." Li Zheng tremblingly picked up the pen.

"Well, just smile for now. Don't ask if you don't understand. Just flip through the book and memorize the equations. I've already taught you everything you need to teach. Being able to deduce a whole set of pictures based on the simplest theory is the basis of physics.

Quality."

"It's really... basic..." Li Zheng had already begun to sweat.

After that, Xie Qifen left the small classroom and wandered around the laboratory.

Li Zheng had no choice but to use thinking acceleration.

Although it is nonsense, it does provide a learning method to solve the problem——

Just derive it yourself.

Of course, you must at least fully master advanced mathematics and linear algebra before you are qualified to push.

Presumably, Gui Jianfeng must have mastered it long ago.

And every time I take the physical education exam, I must be forced to do so.

No, it should have started much earlier.

Maybe he was pushed here like this throughout middle school.

Or earlier, in elementary school.

It's been like this ever since I started working with numbers.

Presumably, whether it is to return to the wind or to resolve the dispute, I have instinctively chosen this set of ideas from the beginning. After tens of millions of derivation, my brain has been strengthened time and time again, and finally it has become so strong that it is unique among ten thousand.

.

Of course, innate reasons may be the dominant factor, but this does not prevent acquired training from playing a role.

Give it a try.

Try following the path of these perverted geniuses.

Li Zheng then started going all out and embarked on a learning path that he had never taken before.

…

Half an hour later, when Xie Qifen returned to the classroom, he saw scratch paper all over the floor.

"Fuck, are you really pushing hard?" Jie Qifan walked up to Li Zheng in surprise, picked up a piece of draft paper and looked at it, "Well... that's what happened..."

Li Zheng himself had also escaped from the accelerated thinking, his eyes were empty, and he was breathing heavily.

He had to use this learning method at such a young age. In the first few hours, he struggled. Most of the time, he could only use brute force and apply various physical formulas in order to deduce the required equations.

It's like throwing a bunch of screws and nuts of different shapes to a blind man and asking him to screw them together. The blind man can only touch the outlines and try them one by one. Only by chance can they match.

But after the 8th hour, Li Zheng gradually gained vision, or in other words, his sense of touch became sharper.

He can just see the shape of the nut and roughly know what kind of screw is needed.

After 30 hours, he could clearly see most details of the nut and was absolutely sure what size screw was needed.

After 45 hours, he knew exactly where every screw was.

55 hours later, he closed his eyes again and returned to the original state. He could twist the required screws with just a light touch on the nut.
To be continued...