Chapter 696: Brother-in-law, did you cheat?!

October 9th.

Friday.

Jingda School of Mathematics.

"Today we mainly analyze the distribution of prime numbers."

Xu Qingzhou stood on the podium.

Although he was quite busy, Xu Qingzhou still opened a course called "Riemann Hypothesis" at Jingda. With his nerves stretched all day, coming out to teach a class was considered relaxation.

And it was quite interesting.

He could feel the vitality of the young people in the classroom.

"Riemann zeta function and prime number distribution. A function on the complex domain—why would the distribution of its non-trivial zeros and trivial zeros be related to the natural numbers, which seem to have nothing to do with each other?"

"This needs to be discussed starting from the Euler formula."

Xu Qingzhou took a pen and wrote the formula on the whiteboard with a swoosh.

Below the stage, the tiered classroom was full of people. Besides students, one could occasionally see people who looked like teachers.

A Fields Medal winner explaining the "Riemann Theorem" he personally interpreted—the attraction was self-evident. Besides people from Jingda, there were quite a few students from neighboring schools coming to audit the class.

Time passed slowly.

In the afternoon, the sun was bright, and the cross-breeze blew through, the classroom curtains fluttering gently with the wind. The soft light penetrated the glass and landed in the corner of the classroom.

Everything seemed quiet and peaceful.

The young man's voice echoed in the tiered classroom.

"The Prime Number Theorem is concise and beautiful, and yet, its description of prime number distribution is still relatively rough. It can give..."

Ding~

Just as Xu Qingzhou was speaking, the phone on the table suddenly vibrated with a buzz.

He reached out to turn off the vibration and continued: "It can only give an asymptotic form of prime number distribution."

"And here, we have to mention Riemann's paper in 1859, 'On the Number of Primes Less Than a Given Magnitude.' This paper..."

Xu Qingzhou stopped, noticing that the phone on the table vibrated again.

It was the same phone number as just now.

"Actually, if mathematicians were to vote for the most difficult content in the history of mathematics, this paper would definitely be at the top of the list."

Xu Qingzhou hung up the phone while speaking.

"As I said before, the Euler product formula is the foundation for studying prime number distribution. Riemann's research actually started from it too..."

"For example, in order to eliminate the product on the right side of the formula, Euler took the logarithm of both sides, and Riemann followed suit. However, the key point comes here—at this step."

Xu Qingzhou wrote down another formula.

"The two can be considered to have parted ways. Euler withdrew his troops, while Riemann embarked on a more difficult, even thorny road."

On stage, the young man talked eloquently, with clear logic, from shallow to deep, occasionally citing classics and giving special explanations.

Below the stage, everyone was exceptionally serious.

Finally, it was the 5-minute break in the middle. He waved for everyone to rest, and Xu Qingzhou also sipped some tea to moisten his throat. In the classroom, except for some who went out to the bathroom, everyone basically sat and rested.

"Tsk tsk, how about it? Didn't come to the wrong place, right?"

Below the stage, a boy said proudly to his friend next to him.

"Yeah, it feels different. Listening to Professor Xu's class, I feel like I've sublimated."

The boy said: "Cough, that's you not understanding, not sublimating."

Friend: "..."

The boy coughed dryly. "However, it is indeed very interesting. My math has always been bad; I only scored 145 in the college entrance examination, but listening to Professor Xu explain it, I feel like I can basically understand it."

The two whispered to each other.

"Who called..."

On stage, Xu Qingzhou put down his teacup, remembering that there seemed to be a phone call just now.

"Professor, I'll help you get some water."

A very observant girl had already come over.

"Thank you."

Xu Qingzhou thanked her. He knew this girl; her name was Zhou Jingshu, and she had taken his class last semester.

Buzz~

Very coincidentally, just as he picked up his phone, the call from just now came again.

"Ho~ quite persistent."

Xu Qingzhou smiled in his heart and answered the phone.

"Hello."

Xu Qingzhou was on the phone, and even used English. Many people below the stage looked over curiously.