"The Navier-Stokes equation!" Tang Xue gritted her teeth and said.

"You...... You're ruthless! ”

"You let me out." Tang Xue's flawless face showed a hint of pride.

"Compared with the world-renowned problems such as the Riemann conjecture, Fermat's theorem, and Goldbach's conjecture, the existence of the Navier-Stokes equation is very low, even in the ancient earth era, few people will mention it, the most important reason is that this problem is really not easy to understand, especially for ordinary people, and even the top PNP problem ordinary people can figure out some, but it is difficult to understand the Navier-Stokes equation, which is why the civil science rarely touches on this problem." Zhou Sen smiled bitterly.

"I don't ask you to untie it, you just talk about it!" Tang Xue felt that she was also a little excessive.

"It's okay to say a few words, but the description of this problem in human history is actually very obscure: 'The undulating waves follow our boat winding through the lake, and the turbulent air currents follow the flight of our modern jets.' Mathematicians and physicists are convinced that both breezes and turbulence can be explained and predicted by understanding the solutions to the Navier-Stokes equations. Although these equations were written in the 19th century, we still know very little about them. The challenge is to make substantial progress in mathematical theory that will enable us to unravel the mysteries hidden in the Navier-Stokes equations. There is no beginning or end to this passage, and it is difficult for you to even guess what the problem is described in this conundrum, which exudes a metaphysical problem. ”

"Be specific!" Tang Xue's eyes became surprised.

"The Navier-Stokes equation was not proposed by one person, in 1775, the famous mathematician Euler, right, not wrong is the four kings of mathematics Euler, he is now mixed with fluid mechanics, he in the book "General Principles of Fluid Motion" according to the change in the force and momentum of the fluid when the inviscius fluid moves, thus deriving a set of equations. Equations such as: (axD+bxD+c)y=f(x), which is the most important basic equation in inviscid fluid dynamics, refers to the differential equation of motion obtained by applying Newton's second law to the inviscible fluid micro-masses, which describes the motion law of the ideal fluid. It laid the foundation of ideal fluid mechanics. ”

"Viscous fluids are fluids with non-negligible viscous effects. The actual fluid in nature is viscous, so the actual fluid, also known as viscous fluid, refers to the property of friction between the flowable layers between the fluid particles and the relative motion due to the relative motion...... It can be said that the Navier-Stokes equations, which were driven by many scientists and engineers, are a set of equations that describe fluid substances like liquid and air. These equations establish the relationship between the rate of change of the particle momentum of the fluid and the change in and dissipated viscous force and gravitational force acting on the inside of the liquid. These viscous forces arise from the interaction of molecules and can tell us how viscous a liquid is. In this way, the Navier-Stokes equation describes the dynamic equilibrium of forces acting on any given region of the liquid. ”

"In fluid mechanics, there are many equations, but many of them are related to the Neville-Stokes equations, which can be said to describe most of the conditions in the fluid field, and of course, the equation also has its application, which only applies to Newtonian fluids. What is Newtonian fluid? To put it simply, it is a fluid in which the shear stress at any point is a linear function of the shear deformation rate. Generally, high-viscosity fluids do not satisfy this relationship, indicating that a simple example of Newtonian and non-Newtonian fluids is the well-known siphon phenomenon. At low viscosity, the siphon must be below the page, but in the case of non-Newtonian fluids with high viscosity, the suction port can still be carried out even if it is higher than the liquid level, because the viscosity is too great......"

"What are the applications of the Navier-Stokes equation?" Tang Xue looked at Zhou Sen with a stupid look and asked.

"For engineering applications, for the most part, it's still dealing with Newtonian fluids, or they can be approximated to Newtonian fluids. It can be said that this equation plays a fundamental role in fluid mechanics, but it also plays a decisive role...... Although the Navier-Stokes equation can describe the motion of a fluid in space. The solution of the Navier-Stokes equation can be used in many practical applications. For example, it can be used to simulate weather, ocean currents, water currents in pipes, the movement of stars in galaxies, and air currents around airfoils. They can also be used in the design of aircraft and vehicles, the study of blood circulation, the design of power stations, the analysis of pollution effects, and so on. ”

However, the current theoretical research on the solution of the Navier-Stokes equation is still insufficient, especially the solution of the Navier-Stokes equation often includes turbulence. Turbulence, also known as turbulence, is a state of flow of fluids. When the flow velocity is very small, the fluid flows in layers and does not mix with each other, which is called laminar flow, or flake sugar; Gradually increase the flow velocity, the streamline of the fluid begins to appear wave-like oscillation, and the frequency and amplitude of the oscillation increase with the increase of the flow velocity, this flow condition is called transition flow; When the flow velocity increases to a large level, the streamlines are no longer clearly discernible and there are many small vortices in the flow field, called turbulence, also known as turbulence, turbulence, or turbulence. Although turbulence is very important in science and engineering, turbulence is disorderly, energy-dissipating, and diffusive. It is still one of the unsolved physics problems to this day. ”

In addition, the fundamental properties of many solutions to the Navier-Stokes equations have not yet been proven. Because the Navier-Stokes equation relies on differential equations to describe the motion of fluids. Unlike algebraic equations, these equations do not seek to establish relationships between the variables under study, but rather between the rates of change or fluxes of these quantities. In mathematical terms, these rates of change correspond to the derivatives of the variables. The Navier-Stokes equation for an ideal fluid with 0 viscosity in the simplest case shows that the acceleration is proportional to the derivative of the internal pressure ......"

"Note that the official statement of each mathematical problem in the human mathematical puzzle, except for the PNP problem, is written by a Fields Medal winner who has made achievements in this field or on this problem, to ensure that the problem can be concisely summarized, so as to ensure the rigor of the problem, while the PNP problem involves the computer aspect, so the official statement is written by Turing Award winner Stephen Cook, and the Navier-Stokes equation exists and is smooth. Official statement written by Charles Fefman. If you don't have a way to understand it, you can simply think that scientists want to find a general solution to the Navier-Stokes equation, which means that the solution of the equation always exists. In other words, can this set of equations describe the situation of any fluid, under any starting conditions, at any point in the future. ”

"Can you untie it?" Tang Xue was surrounded by Zhou Sen and covered with clouds and mountains.

"It's hard...... A set of equations that are difficult to explain mathematically, and you need to prove that the solution of the equation always exists. This has left many scientists devastated. At present, only about 100 special solutions have been solved. The mathematician Jean Leret proved the existence of a weak solution to the so-called Navier-Stokes problem, which satisfies the Navier-Stokes problem on average, but not at every point. Since then, research on the Navier-Stokes problem has stagnated, so it is also known as the most difficult mathematical or physical formula...... In any case, in the process of solving the Navier-Stokes equations, countless new mathematical tools and mathematical methods have been born, leading the way for mathematics to continue to advance. That's the point of these conjectures. ”

After Zhou Sen finished speaking, he looked at the two sisters and brothers with a calm face.

Tang Xue and Tang Changfeng both looked at Zhou Sen with a dull expression, especially Tang Xue, with an incredible expression.

Although Zhou Sen did not solve this equation, his understanding of this equation was enough to impress Tang Xue with him.

What impressed Tang Xue the most was that Zhou Sen's understanding was very comprehensive, and if there was no in-depth research, he would definitely not have such a deep insight.

Of course, Tang Xue didn't know, in fact, in the five star domains, this equation had been solved, but Zhou Sen didn't want to be greedy on this planet, so he just explained some hard things, but he didn't expect that he just repeated some common sense things, which made Tang Xue shocked.

Zhou Sen's explanation and retelling paid off, and now, Tang Xue has completely believed that he is a scientist, because, the religious sect says that it is a story, even some of the words in it cannot be understood, such as "laminar flow", "turbulent flow", "turbulent flow", "turbulent flow", "turbulent flow", these highly professional words, will never be able to be said by those rotten guys.

"Can you really overthrow the West Asian Empire?" Tang Xue said with a look of hope.

"Yes, but ......"

"But how?" Tang Xue hurriedly asked.

"I'll design some weapons, and you're going to make them for me."

"Our supply chain has been cut off, and there are fewer and fewer machines and equipment that we can run at present......," Tang Xue hesitated.

"It doesn't matter, as long as you have the space and resources, I can help you make equipment."

"You're alone?" Tang Xue said incredulously.

"I definitely can't do it alone, but as long as you have a team, I can teach you!" Zhou Sen said with an affirmative expression.

"We had a lot of difficulties, such as transportation. At the moment, there are checkpoints at all key junctions, which has led to the disruption of our supply chain and the inability to transport some supplies......"

"No problem, what do you think this is?" Zhou Sen pulled out the flying skateboard hidden under the sofa.

"What?" Tang Xue and Tang Changfeng glanced at each other, they didn't know what this thing was.

"It's a flying skateboard."

"What is a flying skateboard?" Tang Xue saw the flying skateboard for the first time, and asked with a blank face.

"Look!"

Zhou Sen stepped on the flying skateboard, leaned over slightly, and the flying skateboard took off in the living room, and then flew in a small space.

Tang Xue looked at Zhou Sen in mid-air with a fanatical expression, and Tang Changfeng's eyes were even brighter.

"This flying skateboard is equipped with anti-gravity devices, and when the time comes, I will give you a blueprint that can mass-produce various types of anti-gravity devices, and then, you can modify all kinds of vehicles, so that you can bypass those roads and directly transport them secretly." Zhou Sen flew two laps and landed on the sofa.

"I know who you are......" Tang Xue looked at Zhou Sen with a look of surprise.

"I ......"

"Woo ......"

Just when Zhou Sen was about to speak, suddenly, there was a violent roaring and tumbling sound from the Howling Sky Dog outside, as if the Howling Sky Dog had suffered a loss.

Someone!

"Peng!"

Before Zhou Sen could react, in an earth-shattering loud noise, a majestic and strange force actually swept the walls and roof of the entire wooden house into the air, but the furniture in the living room did not move at all, and then, the huge roof disintegrated in the air, and then, it was twisted into powder by an invisible force, and the powder was swept in the air by a strong wind in the sky, and the mighty and mighty like a long dragon flying in the air, it was spectacular.

What a ferocious force!

The shock in Zhou Sen's heart was incomprehensible, he didn't expect that there would be such a strong character on this planet.

A middle-aged man in a white robe stood in the courtyard with his hands in his hands, his bearing was extraordinary, and the howling dog barked at him from a distance, judging from his embarrassed appearance, it should have suffered a loss just now.

"God of War of West Asia!" Tang Xue said with a trembling body.

"The god of war of the West Asian Empire?"

"Yes."

"That's only a battle!" Zhou Sen slowly stood up, pulled out the Tang knife, and exuded a fierce battle intent all over his body.

"You're no match for him." Tang Xue's voice was trembling, and his fear of the West Asian God of War could be seen.

"It is not yet known who killed the deer!"

Zhou Sen was stimulated to be ruthless, a sinister smile appeared on the corner of his mouth, holding a Tang knife, he walked out of the courtyard step by step from the living room without walls and roofs, and when Zhou Sen left, he unknowingly summoned the flying skateboard into the mecha button, because the atmosphere was tense, no one noticed that the flying skateboard disappeared out of thin air.

"Whew!"

Not good!

An aura of extreme danger pervaded.

Just after Zhou Sen and Tang Changfeng passed by, Tang Changfeng suddenly made a move.

It's a pity, because the distance is so close, even with Zhou Sen's bravery, he can't avoid this sneak attack from behind. In fact, Zhou Sen did not have an embankment Tang Changfeng at all.

"Peng!"

A powerful force knocked Zhou Sen into the air, and then, he fell heavily to the ground and remained motionless. From beginning to end, the god of war of the Nasian Empire was motionless, and the white robe on his body was windless and automatic, giving people the illusion of fluttering immortals flying up at any time.

"Changfeng, you're crazy!" Tang Xue roared sharply.

"Sister, I'm not crazy!"

"You...... You...... You actually betrayed us......" Tang Xue's eyes were red and her face turned pale, and she shook her head in disbelief.

"Sister, I'm sorry, the Awakened are too important to us." Tang Changfeng said with a sneer.

"Are you sure he's the Awoken?" Tang Xue looked at Zhou Sen who was motionless on the ground in despair, she knew that the last ray of hope for the religious sect had been dashed.

"He fits the characteristics of all the Awakened, I think, you already know who he is." Tang Changfeng smiled proudly.

"Changfeng, you disappointed me too much...... Long Wind ...... I don't have a brother like you...... There is no ......"

Tang Xue, who looked desperate, shook her head as she spoke, and suddenly pulled out a gun and aimed it at her temple without warning, but when she pulled the trigger, the expression on her face froze, because her fingers had lost sensation. No, not just her fingers, her entire body was unconscious.

"Sister, you can't die yet, the emperor has seen your photos and will never forget you." Tang Changfeng said with a wicked smile.