On the streets of the United States, ten citizens were randomly interviewed and asked them: "Who is the greatest mathematician of the present?"

Nine out of ten citizens would answer: "John Nash."

Nash and his beautiful heart are so famous, and there are very few film and television cultural works related to mathematicians, so everyone remembers Nash.

Princeton regards Nash as a valuable asset of the school. The information bulletin board on the first floor of the Department of Mathematics building will always be posted with posters of beautiful souls.

Nash made outstanding contributions to game theory, which is a consensus among all the professors here.

Professor Milno has made greater achievements in improving differential topology, k theory and other systems, which is also the consensus of the professors.

These heavy systems are established, and they only have two professional standards for measuring the level of mathematicians: system and innovation.

In today's mathematics community, it is becoming increasingly difficult to innovate in the true sense. Integrating the system has become a reliable way to prove the truth, and you can see hope in your lifetime at least.

With a completely innovative and rigorous system, whoever can figure this thing out will have to kneel down for you in the entire mathematical community.

Professor Milno's lifelong integration of neighboring systems, and the three major slams of mathematics awards are the best recognition of his career.

"Raise for John Milno." Director Ferverman raised the coffee cup.

"John Milno."

"John Milno."

Everyone raised their glasses and recited the name John Milno.

This is how Americans are. When they feel inspiration, they like to celebrate or pay tribute to some things or people, from the bottom of their hearts and have sincere feelings.

Professor Milno smiled slightly, accepted the tribute from everyone, and said: "I was born in New Jersey and spent my whole life in Princeton. I think it's time to leave."

"No, John?"

"Where are you going?"

Professors and doctoral students were surprised. How could the old man leave just by saying that?

Milno said: "I am in my 80s and it's time to take a break. I sold my house in the United States. Fortunately, I can buy a house with a size of three times the size in Oristano for the same price."

Oristano is a small town and resort in Sardinia, Italy.

"So John, you're going to Sardinia to enjoy life." Director Charles Feverman understood. Professor Milno retired and was ready to bid farewell to the world.

"I will send you a postcard, Charles." Professor Milno said with a relaxed look on his face.

Director Feverman put down the coffee cup, and walked to Professor Milno, took out an exquisite signature pen from his pocket, and placed it solemnly on the table in front of Professor Milno.

"Sales for the country, for every country." Director Feverman stretched out his right hand to shake hands with a respectful expression.

Professor Milno didn't get up, he smiled and nodded, sat down and shook hands with Director Ferverman.

The coffee time, which was originally relaxed, suddenly became solemn.

Next, Edward Witten walked to Professor Milno, and also placed a signature pen. He shook hands with Professor Milno respectfully: "Salary for the country, for every country."

Like rehearsing in advance, dozens of F, A-prize winners, including Faltings, Linden Strauss, Okunkov, Hulst, and Lench, were repeatedly doing the same thing.

Every big bull gave Professor Milno a signing pen and said the same sentence: "Salary for the country, for every country."

The saying "Sales for the country and for every country" is Princeton's informal school motto. If you don't hear this sentence, you can hear some special sincerity.

There were dozens of various signature pens in front of Professor Milno, neatly arranged in a row.

People with status and status in the United States will carry a high-end signature pen with them in case of signing checks and documents at any time.

For mathematicians, pens are the closest companions, and all of these great professors carry pens on them.

And these pens are now given to Professor Milno, in a conventional ceremony.

Shen Qi was shocked. He knew that this scene was definitely not rehearsed in advance, it was a temporary incident.

"When you retire, the more pens you receive, the greater your achievements. This is a Princeton-style tribute. If you recognize the achievements that person has achieved, then give him a pen." Professor Muller said to Shen Qi, then stood up and prepared to present a pen to Professor Milno.

Shen Qi stood up and took out the Montblanc sign pen she carried with him. After all, he was a master, so we had to carry the pen with us, right?

"Shen Qi, sit down." Professor Muller pressed Shen Qi back to the chair.

"I fully recognize Professor Milno's outstanding achievements." Shen Qi wondered, why can't I give a pen to express my respect?

"When you become a formal professor in Princeton, you will be qualified to give away a pen. But now, it's not possible." Professor Muller told Shen Qi the rules and then presented a pen to Professor Milno.

With a bunch of pens and high respect, Professor Milno left the cafe and will soon leave his hometown of New Jersey to move to Europe.

The Princeton-style farewell ceremony is simple and romance, and is respected here because of morality, wisdom and academic contributions.

The old leader of the Mirno village, Jin Peng, washed his hands. His legend will always be passed down in the world. He has never written a complete proof on the blackboard, but it has included the most advanced math award.

"The establishment of a system is the most important thing." Shen Qi was inspired by Mirno's actual case.

However, everyone knows that establishing a system with rigorous logic is much more difficult than proving a theorem. Building a system is a huge project that requires huge and continuous human, material and financial investment.

The only advantage of establishing a basic learning system is that it does not cost too much astronomical money, and the biggest investment is human resources investment.

"I am short of soldiers and generals, and I am still limited in my ability. I can't figure out a new theoretical system at present. Let's prove my theorem first. If there are too many theorems, the system will come out naturally."

It is this reason that Euclid proved 465 theorems throughout his life, and the classical system of Euclidean geometry has been passed down for more than two thousand years.

Shen Qi continued to carry out the proof work of "Müller-Shen's theorem" and collaborated with Muller in the first draft at the end of September.

"The exciting result is that we fully prove the conclusions 1) and 2) are more perfect than what I proved in 1982, without any flaws." Muller's excitement turned to a meditation: "But the problem is that the proofs of the conclusion 3) are frustrating, and maybe another month we will complete the final proof."

Shen Qi said: "Each of x* close convex set is close to the tight Chebischev set. For this statement 3), I think our initial idea was wrong. It is independent and does not need to be linked to the statement 1), 2). But this is not a bad thing, perhaps, it is still a thankful thing because we discovered it early."
Chapter completed!