Chapter 819 2 ways of proof

After all, Perelman understands it, but he doesn't like this exaggerated pomp.

Perhaps this is one of the reasons why he chose to retire after proving the Poincaré conjecture.

Therefore, these dozens of people were finally dismissed.

Only a few people with high enough status were left behind who were really difficult to get rid of.

Among these people, Perelman only met Tian Gang once, and as for the remaining few, he really had no impression.

Therefore, after Chang Haonan introduced them, they just said hello and walked to the hotel lobby with the other people who got off the car.

It's not that China can't even find a third scholar with a surname who has appeared in a well-known mathematics journal - although China's theoretical mathematics field is a bit more advanced, it is not so shabby.

The main ones here today are either researchers in the field of differential geometry or leaders of several colleges or schools with strong mathematics majors.

inside these people. There's really no one that's too famous.

Scholars from other unrelated research fields may come to listen to the lecture, but they will certainly not join in the fun.

That’s why this rather embarrassing scene happened——

Of course, it is definitely not Chang Haonan and Perelman who are embarrassed.

"By the way, Professor Tian."

Perhaps to lighten the atmosphere, someone suddenly asked Tian Gang next to him:

"I remember that according to the arrangement, Professor Perelman's report should be scheduled for tomorrow morning, so on your side..."

This question was somewhat inappropriate, and the atmosphere at the scene did not really relax.

Tian Gang looked at the retreating figures of the group over there and sighed softly:

"I have no choice. I bumped into this guy, so I can only postpone it for a few days."

To say that he is depressed, he must be depressed.

After preparing for so long, you end up being upstaged by a school that is not good at mathematics at all. Who are you going to talk to to explain this?

But he wasn't helpless.

At least at this time, Perelman was not among the most influential mathematicians.

After all, he hasn’t won the Fields Medal yet.

Therefore, Tian Gang's idea is also very clear. He just needs to use his connections to find a way to hire a higher-level boss.

Thinking of this, he had already begun to select suitable and possible candidates in his mind...

……

Perelman's visit had been publicized as early as the beginning of the year, so on the day when the lecture was scheduled, the venue was already packed more than an hour before the official start.

In addition to professors and researchers, there are actually many students.

Some are math majors and really want to listen to something.

There are also some who are just joining in the fun.

At the front of the lecture theater, today’s title is displayed on the huge curtain——

"Reduced Volume and Non-Local Collapse Theorem"

And slightly below, the inviter of this lecture is noted:

Professor Chang Haonan.

"Chang Haonan...is this Chang Haonan who proved Chang's lemma last year?"

In the back row, a student-looking audience member whispered to his companion next to him.

Obviously, this name is not as famous in the mathematics world as it is in the aviation world.

"It should be. I remember that Chang's Lemma is also a result in the field of differential geometry, and is very close to Perelman's research direction..."

The companion next to him replied:

"And there are very few scholars studying this field in our country. It is unlikely that there will be two people with the same surname..."

Of course, more people are still paying attention to the topic of today’s lecture.

That's not to say that Chang Haonan is unimportant.

Rather...

"Professor Tian, this non-local collapse theorem, pardon my ignorance, is it the latest achievement in the field of differential geometry?"

Another professor sitting next to Tazuna asked with a slight frown.

He felt that even if China's research level in this area was not high, it should not be able to understand other people's results.

However, today I didn’t even see the speaker, so I immediately doubted life——

Not just the results, why can’t I even understand the title?

But Tian Gang also hesitated for a moment, and then shook his head:

"Non-local collapse is a very common concept, but the theorem..."

Apparently, he hadn't heard of it either.

But as a scholar who gave a 45-minute report at the International Congress of Mathematicians, he still has a lot more knowledge:

"However, it is said that Perelman has a very strange habit. He sometimes publishes his results directly without going through any journals."

"There are still people like this?"

The professor next to him was immediately shocked:

"In other words, this could be another new achievement?"

"Hmm...it's possible."

Tian Gang nodded:

"But strictly speaking, any result cannot be called a theorem before it is widely recognized by the mathematical community..."

Having said that, almost everyone nearby who heard this conversation made the same move in unison.

Take out the notebook.

Open.

Take out the pen.

Prepare records.

The reason why I say almost is because some people are busy borrowing pens and papers from around, so the response is a few beats slow...

In fact, you can't blame them for not bringing a pen on such an occasion.

This kind of lecture, whether at home or abroad, does not have high academic value.

After all, in most cases, what you talk about is what you have already published.

And the people who should see this content have already seen it.

So the core still depends on the influence of the person standing on the stage.

It's just that I met such a strange person today.

Just as everyone in the audience was speculating about the content of today's lecture, Perelman finally appeared on the stage, wearing a neat suit.

But his first sentence did not mention himself:

"I think everyone here should have read the paper published by Professor Chang Haonan in the Annual Journal of Mathematics last December."

His English still had a peculiar accent and vibrato, but he obviously lowered his speaking speed deliberately to ensure that most people could understand him.

Therefore, when this sentence ended, everyone's eyes turned to the edge of the first row.

Chang Haonan is sitting there.

He had previously known the title of Perelman's lecture today. Although he did not know the content, considering that the non-local collapse theorem was something that the other party had discussed with him via email, he was already prepared for his name to be mentioned. Prepare.

Facing hundreds of looks, Chang Haonan just turned around slightly, smiled and nodded.

"Based on Chang's theorem, I discovered another rule."

Perelman turned around and pulled several blackboards to him.

For mathematicians, even if they have PPT and projectors, they often prefer traditional tools such as blackboards or pen and paper.

"Next, I'll show you how to give a local injective radius on a specific higher-order manifold."

After speaking, he began to write quickly on the blackboard.

"Let g(ij) be a complete manifold on M, and satisfy g(ij)/γ=2R(ij)..."

The secretary next to him also started to follow his steps and kept turning the pages of the PPT...

An hour and a half.

A full hour and a half.

Perelman spoke with fascination.

The audience in the audience was in a state of ecstasy.

The Ricci flow on high-order manifolds is extremely abstract. In addition, it has not been long since Chang Haonan's paper was published. Not everyone can understand it and use it flexibly like Perelman.

Therefore, except for Chang Haonan, who had seen this idea before, he basically didn't understand it.

Including Tian Gang.

But he is better than others, at least he can barely keep up with his thinking.

Of course, this is nothing unusual for theoretical mathematics.

After all, it is a new theorem. Let alone a lecture, even a paper will take several days or even months to study.

Therefore, everyone has diligently written down Perelman's proof process.

Go back and take a look.

No matter what, they all witnessed history at least once today.

Not a loss.

However, at this time.

Perelman turned around and picked up the blackboard eraser from the nearby table.

Then, he returned to the blackboard.