I Don’t Want to Win Lying Down

It's really not difficult,

If Xu Mang is forced to find it difficult, if he expands a simple question into such a complicated one, it is quite difficult to read and almost never passes out. Who is the problem?

I really want to kill him.

The voice just fell,

Tong Min and Lu Bo looked at Xu Mang in surprise. He just said it was not difficult?

"Xiao Xu?"

"Are you sure it's not difficult?" Tong Min asked with a look of surprise: "If you take a closer look, you may be mistaken. This topic is not as simple as you thought. Moving from frequency to volume expansion, this calculation The amount is very large, are you sure it is not difficult?"

"is it?"

"I think it's okay" Xu Mang said with a smile, "Do you have paper and pen?"

"Yes!"

Lu Bo hurriedly took out a consistent black pen, and handed it to Xu Mang, passing a writing board with some manuscript paper on it.

After getting the paper and pen,

Xu Mang started his own performance, but this time he planned to write slowly, and while calculating, he pointed out the mistakes of these people.

"Look at it"

"According to the photon, that is, when v to dv, the volume expands to v(t), so this calculation process is like this." Xu Mang wrote a very complicated calculation process, but as he continued to simplify, this complicated calculation gradually changed It's easy.

"If t(t)=r(t)t(t)/r(t), the distribution form of the black body spectrum can still be obtained." Xu Mang lightly wrote the formula on the white paper, but at this moment, the scene The atmosphere condensed to freezing point.

Tong Min, Lu Bo, Liu Yan, and Zhao Pengpeng could hardly imagine what happened before them. The problem of stumping themselves for more than half an hour became so simple in the hands of this stranger.

Is this in a fantasy world?

A dream world?

How else can it be done!

From an extremely complicated calculation process, with continuous simplification, gradually removing the fog and revealing its current appearance, the four present at this moment felt that they were about to suffocate, especially Liu Yan, a graduate student from the Department of Mathematics.

although,

It's all about the calculation process of physics, but every step of his process from complicated to simple, made Liu Yan unable to believe her eyes. Are you sure this guy reads physics? Instead of majoring in mathematics?

This mathematical ability

It seems to be almost the same as his professor.

While the four of them were still in shock, Xu Mang had already completed his proof of the distribution of heat balance and the time dependence of temperature. The whole process was as smooth as flowing water, without any hesitation.

"finished"

Xu Mang smiled and asked, "Is there anything you don't understand?"

""

""

""

The four of them remained silent, shocked by Xu Mang's powerful strength.

"Xiao Xu?"

"Who are you?" Tong Min raised his head and looked at Xu Mang seriously: "Are you really a Fu University student? Are you ET?"

"Have you ever seen such a handsome et?" Xu Mang said grimly: "Allow you to have opinions on me, but please don't question my appearance. Shengshi Meiyan is not a joke, I have a nickname at Fuda ——Arsonist, do you know what it means?"

"The man who set fire in the woman's heart" Xu Mang sighed, glanced at Yang Xiaoman, and said helplessly: "I don't want to bear such a name, but it's a fate, and I can't change it."

"???"

"???"

"???"

So narcissistic,

It's so bad!

Isn't this guy a lunatic?

"Ahem!"

"I mean handsome Xiao Xu?" Zhao Pengpeng said with a wry smile: "Mr. Heart-to-heart arsonist, can you solve the third problem? If the above gas is replaced by a non-interacting but mass particle gas, and start Time is in thermal equilibrium. Under the influence of the expansion of the universe, is it in thermal equilibrium?"

Words fall,

Four eyes shone on Xu Mang's body, and the four looked forward to Xu Mang's answer.

Faced with this question, I don't know what kind of explanation this mysterious Xiao Xu will give, whether it was the same as the previous two questions and got the answer in an instant, or the myth ended here.

Xu Mang didn't look at the topic. The third question and the second question are interrelated. Now that the second question is solved, the third question is as simple as trying to get something out of the bag.

"Talking"

"Are you being trapped?" Xu Mang asked curiously: "These problems shouldn't be solved by graduate students like you. It involves many concepts. The second and third questions are based on heat death. In other words, the cosmological inference of the second law of thermodynamics starts from this core."

"you guys"

"What is the name of the professor who provided this topic?" Xu Mang asked.

Hearing Xu Mang's words, the expressions of Tong Min and Lu Bo were filled with the word calm. Tong Min said: "Professor Simpudi, an expert in astrophysics, is an alternate member of the Princeton Astrophysics Association."

Xu Mang:? ? ?

What?

Alternate member?

Reserve?

Xu Mang heard for the first time that his research organization still has so-called reserve players.

"Is this guy discriminating against China?" Xu Mang asked curiously: "From your point of view, I felt the malice from the author of the question. This is deliberately embarrassing you. With your limited level, it is impossible. Solving such complicated cosmological problems."

Xu Mang's remarks made the four feel a little unconvinced. In his eyes, the graduate students of the Ivy League have become of limited level?

indeed

Xiao Xu is very powerful, but Coco can't be so arrogant, right?

This relativity cosmology problem, and Xiao Xu is engaged in the theory of relativity, although there are some differences, after all, it is a system that understands more or less.

"Correct!"

"He has a famous saying that he would rather recruit white and black students than Asian students." Tong Min said: "I and Lu Bo are exceptions. I have to teach if my grades are too good."

Xu Mang nodded and said calmly, "I will help you solve the third problem first."

Words fall,

Xu Mang began to solve this problem. In fact, this malicious professor still has a little conscience. In terms of the concept of difficulty, Xu Mang proposed a classification of ordinary, nightmare, hell, and death. Difficulty level, but there is a difficulty that transcends cognitive concepts.

It's called Xu Mang class

As far as the three current issues are concerned, they have only reached the nightmare level.

"in fact"

"For this problem, we must first calculate the number of particles with momentum between p and p + dp in the thermal equilibrium under the ideal gas approximation." Xu Mang explained the calculation process in an understatement.

"The chemical potential of e can make it equal to zero. Since the expansion of the particle is adiabatic, tvr-1=constant." Xu Mang raised his head, glanced at the four people, and said: "So the existing thermal balance will be destroyed."

This

Is this the end?

Not even 30 seconds!

"Little Xu?"

"Resolved?" Tong Min asked in surprise.

"Yes indeed!"

"It's not a big problem in itself." Xu Mang said with a smile: "There are some conceptual knowledge in it, you don't understand normal things, but to me it's a matter of hand, and it's done with a white eye."

The four of them did not speak, but stared at Xu Mang silently. This guy became more and more mysterious. He looked particularly young. Although he was wearing glasses, the overall outline seemed familiar.

"The last problem, I'm going to grill the skewers." Xu Mang shrugged and said lazily, "Let me take a look first."

moment,

Xu Mang began to solve this last problem. It is still in a hypothetical cosmic space, but this condition is even more extreme. The photon gas has no interaction with each other, and the mass is all zero, while the particle gas is composed of mass. At a certain moment, the photon and Neutrinos are in a state of thermal equilibrium.

The mass of the neutrino is then used to give the typical velocity and kinetic energy.

Not difficult!

But it's cheaper!

When Xu Mang saw the last request, he was almost not mad, and the difficulty suddenly increased from the nightmare level to the death level.

The professor asked for a fairly precise value.

Are you crazy?

Xu Mang's original decadent state suddenly disappeared, and his face was full of seriousness at this time.

Damn it!

ruthless!

This seems to really not be solved for a while.

Just as Xu Mang was thinking about how to start, Tong Min and Lu Bo's hearts almost mentioned in their throats. The two saw Xu Mang's expression change. They were no longer as calm as before, but had a little seriousness. child.

That's it!

It feels bad!

Sure enough, the final problem is different.

The two looked at each other, and both saw a trace of worry in each other's eyes. The first three problems were solved perfectly, but they fell on the last one.

Ugh

It seems that

The miracle is over.

"Xiao Xu?"

"No, even if we can solve the three problems, it is already very good. I think the professor will not embarrass us because of this." Tong Min said seriously: "The last question he told us, no matter we find anyone, As long as it is unlocked, we will graduate. You can imagine how difficult it is."

Xu Mang was stunned for a moment and asked curiously: "So rampant?"

"???"

"???"

"???"

Hearing Xu Mang's words, the four of them looked dumbfounded.

What do you mean?

It seems you are more rampant than him!

"Xiao Xu!"

"This doesn't mean being rampant, how can I explain this to you?" Tong Min said helplessly: "It means that he didn't give us any chance at all. The last question is furnishings. Just take a look."

Xu Mang understood what he meant, that he deliberately mischievous.

but

This problem is not unsolvable, but it is more complicated to demonstrate, and there are great challenges in calculation.

Indeed, UU reading www.uukanshu. com

It is a bit more difficult to let these two graduate students majoring in astrophysics solve this problem. Unfortunately, when I met Ben Shengshi Meiyan, I can only say sorry to the malicious professor. These two students are probably about to graduate early.

"Ugh?"

"After you graduate, do you inherit your family business, or do you plan to conduct academic research in astrophysics?" Xu Mang asked curiously.

"If it is to inherit the family business, then I will go to business school." Tong Min said seriously: "If I graduate successfully next year, I plan to engage in research in astrophysics."

"same."

"I am engaged in academic research in astrophysics." Lu Bo said.

Xu Mang glanced at these two people and fell into silence.

for a long time,

Xu Mang said apologetically, "I'm sorry I will disappoint you."