Chapter 366

A fierce quarrel between the two rang out.

The quarrel was loud, attracting the attention of some people next to him, including Cheng Nuo and He Youjun.

The two people, one black and one white, stood directly on the stone steps of the activity center, and quarreled with red faces.

Looking at the stance, if no one stops it, I'm afraid there will be a fight soon.

Cheng Nuo sat on the side, looking sideways at this side, completely watching a play.

The reason for the quarrel between the two is not clear, but judging from the words of the conversation between the two, it should be about the solution of a certain mathematical problem, and there is an irreconcilable disagreement.

Gradually, the two people who couldn't tell the winner from the mouth cannon began to push each other.

The other two companions who were with them, the old god was there, and they didn't look like they were fighting at all.

Depending on the situation, it has long been commonplace.

Suddenly, a white classmate was pushed by Xiao Hei's classmate, and his body's center of gravity was unstable, and he fell directly to the side.

And sitting on the other side were Cheng Nuo and He Youjun.

Fortunately, Cheng Nuo was a man who won with speed, reacted extremely quickly, and supported the fallen white classmate with both hands.

The white classmate fell into Cheng Nuo's arms, leaning on Cheng Nuo's broad chest, and his blue eyes seemed to flash something strange.

The white classmate looked at Cheng Nuodong's well-edged cheeks, and subconsciously swallowed his saliva.

Cheng Nuo had an inexplicable chill behind him, and he had a bold conjecture.

But in order to maintain his image, Cheng Nuo politely helped the white classmate up.

The white classmate shook hands with Cheng Nuo excitedly, "Hello, my name is Chari, thank you very much for your righteous action!"

Cheng Nuo smiled friendlyly, "Cheng Nuo, from Huaguo!"

The white classmate was even more excited, and put his arm around Cheng Nuo's shoulder, "Huaguo?

"By the way, Cheng, which college are you from?"

Cheng Nuo thought for a few seconds, "Uh...... I guess I'm a mathematics student in the Faculty of Science!"

"What! You're also a math major! Great!!" Zarry, who was excited at every turn, was excited again.

Regardless of whether Cheng Nuo agreed or not, he took Cheng Nuo's arm and walked to the little black classmate.

Xiao Hei successfully defeated Tsari-chan by force with his strong body, but he was not easily convinced.

"Hey, Rook, I've found a math major, why don't you let him judge our opinion for us?"

Xiao Hei hugged his arms and glanced at Cheng Nuo lightly, "Chari, are you kidding! What we are discussing is not a test-taking question, but an advanced math problem. ”

"As far as this undergraduate friend of yours is, I'm afraid it's hard to even understand what we're discussing!"

Chari didn't care at all about Xiao Hei's ridicule.

Cheng Nuo couldn't help it.

Eat your rice at a young age!!Haven't you ever seen a genius?

Lao Tzu has been looked down upon in various ways at home, and it is still the case abroad!

This force, if you don't finish pretending and pretending to be beautiful, you're sorry for the title of the king.

Cheng Nuo stretched out his hand, his tone was light, and he said to Chali, "Take the question?"

Chari was a little unresponsive to the sudden change in the tone of his newly met Chinese friend, and after a few seconds of stunned, he handed a piece of paper from his schoolbag to Cheng Nuo and said, "This is a question we found when we were browsing ResearchGate, and there is no correct way to solve it yet." ”

ResearchGate, Cheng Nuo has heard of this website, in short, it is a Favebook that belongs to scientific researchers.

Cheng Nuo took the title and read it again.

[Verification: When 2≤n≤N, the following continuous product inequality holds:

√2√3√4√5...... √n≤3/2^n-1√n+2≤√1+2√1+3√1+4√1+......+(n-1)√1+n】

Cheng Nuo thought to himself that he finally knew why he heard the words of Ramanujan's identity in the quarrel between the two before.

It turns out that this problem is a variation of Ramanujan's identity.

The so-called Ramanujan identity refers to an identity named by the great mathematician Ramanujan.

The formula is: 3=√1+2√1+3√1+4√1+5√1+n......

There are two more mainstream methods of proving this identity, so I won't repeat them here.

In short, the question that Chari showed Cheng Nuo is closely related to Ramanujan's identity.

Tsari then handed Cheng Nuo another piece of paper, on which were densely written mathematical formulas, "Ah, this is the proof step of Luke." He thinks that his proof steps are correct and there is no problem. But I think he was wrong in the process of proofing! Because of this, we quarreled!"

That's why!

People who study academics, even the reason for the quarrel, is so high-end and high-end.

"Then you think he made a mistake in that step?" Cheng Nuo asked.

Chari scratched his head, "I don't know, by feeling." ”

Cheng Nuo: "......"

Big brother, you cheat!

Cheng Nuo was speechless for a few seconds, took the A4 paper full of steps, and browsed it line by line.

There are not many formulas, just one page. In three minutes, Cheng Nuo finished reading.

After reading it, Cheng Nuo raised his head and met Shang Chali's gaze.

"How's it going?" asked Charri, seemingly expecting a lot from the Chinese student he had never met.

Cheng Nuo smiled slightly and stretched out his hand, "Come on!"

"Here, here, and here, the steps are all wrong!" Cheng Nuo took a pen and pointed out four or five places, and explained the reasons for the mistakes in detail.

This question should be considered a difficult level for most doctoral students.

And judging by their age, Chari and that little black classmate should still be studying for a master's degree, even if they are MIT students, it does not mean that they can easily fight across levels.

Such difficult questions are still a little difficult for them.

Xiao Hei, who was pointed out by Cheng Nuo as wrong, looked ashamed, but still kept his mouth shut.

His face turned red, and his fingers trembled and pointed at Cheng Nuo, "Aren't you very strong, the pen is for you, you can write!"

Cheng Nuo shrugged with a smile and smiled faintly. "No problem!"

That's what I'm waiting for, Xiao Hei!

The first pretending trip to a foreign country, I didn't expect the first stop to happen here.

Heaven is destined, then let it be.

Holding the pen, Cheng Nuo moved.

On the left side of the proband, [when 3≤k≤N, Bernoulli's inequality can be obtained: 2*(3/2)^k-2=2*(1+1/2)^k-2>2*(1+k-2/2)=k. i.e. k& lt; 2*(3/2)^k-2，k=3，4，...... n, so, √ 2√3√4√5√...... √n≤√2√2*(3/2)√2*(3/2)^2√2*(3/2)^3......】

On the right side of the proof, [because k=√1+(k-1)(k+1),k=3,4,5,...... , so 3=√1+2*4√1+2*√1+3*5=√1+2√1+3√1+4*6=......=√1+2√1+3√1+4√1+......+(n-1)√1-n(n-2)......]

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PS: Is school about to start?