This made Fefman feel extremely surprised, not only because Duan Yun let him see the birth of a new formula for topology, but also because Duan Yun gave him the desire to learn again.

"Mr. Duan Yun, I still don't understand why you don't use the formula of the axiom of countability to ......calculate this step," Fefman frowned at this time, and asked with his hand the formula newly listed by Duan Yun, "This doesn't seem to be in line with the rules of the linear law of topological space, right?"

"The so-called linear law of topological space actually has specific limitations, and it is not suitable for all three-dimensional figures, and in some specific overlapping space three-dimensional shapes, there will be several additional variables, so the linear law of topological space will be biased in the face of these special three-dimensional spaces, and the calculation results will be ......" Duan Yun said while scribbling on the paper, and said with a fluttering eyebrow: " My new formula has taken into account all the variables of surfaces and dimensions, which can be regarded as an extension of the linear law of topological space, so that this new formula can be applied to the demonstration of the Hodge conjecture, and many key problems can be easily solved......"

"Uh......" Fefman picked up the formula that Duan Yun had written on the paper like a treasure, and begged Duan Yun with a sincere face: "Mr. Duan Yun, can I collect the draft of this formula of yours? Don't worry, I won't steal your academic results, I just want to take it back and study it carefully......

For Fefman, Duan Yun's newly discovered mathematical formula can be called a great breakthrough in topology, and the paper with Duan Yun's own handwritten formula will definitely become a cultural relic in the future, just like Leonardo da Vinci's manuscript, which has a very high collection value.

This is also the reason why Fefman and Duan Yun deigned to ask for this draft, which is not something that ordinary outsiders can understand.

"You're welcome, just use it. Duan Yun said with an indifferent expression.

If it were an ordinary scholar, Duan Yun would still keep an eye on it to prevent the other party from stealing his newly discovered formula, but for a top mathematician like Fefman, Duan Yun would not have the slightest worry, because Fefman had already achieved fame, even if there was no academic breakthrough in the future, it would not affect his status in the history of mathematics, this is the realm!

"Could Mr. Duan Yun please continue to finish this new argument of your Hodge conjecture?" Fefman said to Duan Yun with a respectful face.

"Absolutely. Duan Yun smiled slightly, and then continued to explain to Fefman.

Time passed minute by minute, and after a whole morning, the old and the young sat face to face, without the slightest intention of pausing.

Duan Yun is a math enthusiast, and Fefman is more fanatical about mathematics than him, so the two of them have a very high enthusiasm when discussing world problems such as Hodge's conjecture, and even listening to Duan Yun's explanation, Fefman has completely entered a state of selflessness.

At this time, there were already a lot of other guests scattered in the restaurant, and due to the problem of jet lag, many scientists arrived at the hotel in the middle of the night, and just got up in order to reverse the jet lag, and lunch was eaten as breakfast.

And when these people saw Duan Yun and Fefman sitting by the window, they were all surprised.

The people who can participate in the World Congress of Mathematicians are the world's top mathematicians, and some of them have even participated in several sessions, so they all know Fefman, and Fefman is also the idol of many participating scholars.

As for Duan Yun, although his paper has been successfully published in the journal Acta Mathematica, because there is very little information about Duan Yun, no one will directly recognize Duan Yun as the strange person who successfully proved the Hodge conjecture and the Riemann conjecture and shocked the entire mathematical community.

However, when these people saw that the two of them were concentrating on studying math problems face to face, they didn't mean to bother, but just cast curious and surprised eyes at the two of them.

If this is in China, seeing a world celebrity like Feffman, I am afraid that his dining table is already surrounded by a sea of people, but in foreign countries, this situation is rare, which shows that in this regard, the etiquette quality of Europeans and Americans is indeed very high.

And these mathematicians also know that when studying math problems, the most taboo thing is the interruption of others, so these mathematicians who entered the restaurant lowered their voices to try not to disturb the communication between the two.

Sister Gao, Duan Yun is there. At this time, Ouyang Xiangnan and Gao Jing also came to the restaurant together, and at a glance, they saw the bright bald head by the window.

Afterwards, the two walked directly in front of Duan Yun.

"It's really not interesting, and you won't call us ...... for dinner," Ouyang Xiangnan walked to Duan Yun's table and said with some dissatisfaction.

"Eh, why did you two get up?" Duan Yun came back to his senses after hearing Ouyang Xiangnan's voice, and turned his head and asked in surprise.

"It's noon, how can you still lie in bed. Ouyang Xiangnan pursed his lips and said.

"Ah, who are these two?" Fefman was stunned for a moment after seeing Ouyang Xiangnan and Gao Jing, and then asked.

"The two of them are my friends, and they came with me this time. Duan Yun smiled and replied to Fefman, and then introduced to the two: "This world-famous mathematician, Professor Fefman, he is the chairman of this World Congress of Mathematicians, get to know him." ”

"Hello two ladies. Hearing this, Fefman politely greeted Ouyang Xiangnan and Gao Jing.

"Ah, it's an honor to meet Mr. Fefman. When Ouyang Xiangnan heard this, a flash of surprise flashed in his eyes, and he immediately greeted him in fluent English.

Gao Jing on the side couldn't help but be taken aback when she learned Fefman's identity.

Although Ouyang Xiangnan and Gao Jing have little interest and understanding of higher mathematics, they also know that it is absolutely extraordinary for them to become the chairman of the World Congress of Mathematicians, which is completely out of respect for academic authority.

"It seems like it's time for lunch...... Duan Yun glanced at the wall clock in the restaurant, and then said to Ouyang Xiangnan and Gao Jing, "You two find a seat." ”

"I'm very sorry to disturb Mr. Duan's meal, I was going to have breakfast with Mr. Duan, but it turned out to be ......," Fefman said apologetically.

"It's okay, I'm not hungry, I've eaten a lot on the plane. Duan Yun said with an indifferent expression.

"Since...... Mr. Duan, if you're not hungry......" Fefman hesitated, but still gritted his teeth and said, "Actually, I'm not hungry either......"

"Forehead ......"

Duan Yun was stunned for a moment when he heard this, the two glanced at each other, and then laughed at the same time, and after a while, the two were immersed in the world of mathematics face to face again......