The waiter glared at Hilbert angrily, clutching the napkins tightly in his hand, but refused to give them to Hilbert, Lin Yuan looked at the two people who were in a stalemate, and a strong sense of absurdity arose: the two most intelligent brains on the earth were in a contest, and an ordinary waiter wanted to interrupt the process alive!

Lin Yuan hurriedly stepped forward and said to the waiter: "If it's okay, you can give him the napkin, and if your manager wants to scold you, just say that I said it." ”

The waiter saw Lin Yuan speak, so he handed a stack of napkins in his hand to Hilbert, only to see Hilbert writing something on the napkin quickly, his eyes were happy and confused, the napkin was quickly used up, and the waiter had already walked away, and Hilbert was anxiously looking for something to write around.

Zhang Yuanyi then said to Lin Yuan: "Tell him where we live and let him come to us at night." ”

Lin Yuan asked, "What is written on that napkin?" ”

Zhang Yuanyi smiled and said, "You tell him first, and I'll tell you when he leaves." ”

Lin Yuan then said to Hilbert: "If you don't figure it out now, you can go back and think about it, and when you figure it out, come back to us at night, and we will live in the post house next to the Capitol." ”

Hilbert nodded again and again, picked up Zhang Yuanyi's napkin full of words and walked out, as soon as he left, Lin Yuan asked Zhang Yuanyi: "What are you writing on that napkin?" ”

Zhang Yuanyi said with a smile: "I wrote a total of forty-eight numbers, each two divided into a group, of which sixteen groups are twin primes, and then I circled the first four groups of twin primes, and then gave him the napkin, he understood after seeing the napkin, I asked him to judge which groups are twin primes below, so he began to calculate, but the amount of calculation is not small, he soon had no place to write, so I asked him to go back and continue to calculate, and then come to me when the calculation is done." ”

Lin Yuan asked, "Isn't it just a few sets of twin primes?" Would he really be that interested? ”

Zhang Yuanyi said with a smile: "The method of finding prime numbers has been available for a long time, but there are no computers in this era, so when the numbers are very large, it is particularly laborious to calculate, and my groups are not found in this era, and he will definitely be interested." ”

Only then did Lin Yuan understand that at this moment, he saw Wilhelm II return to Lin Yuan's side, handed him an invitation, and said, "This is the admission ticket for the Technique Expo, you are welcome to come and watch it tomorrow." ”

After Lin Yuan thanked him, he accepted the admission ticket, and Wilhelm II went to chat somewhere else, Zhang Yuanyi looked at the invitation and said with a smile: "Take me with you tomorrow." ”

Lin Yuan said: "These are all applied techniques, aren't you engaged in theoretical research?" How? Are you also interested in these things? ”

Zhang Yuanyi smiled and said, "Of course, I'm going to see how the brilliant minds of the masters were ruined by this group of ignorant craftsmen!" ”

Lin Yuan didn't say much, so he agreed, and when it was evening, Hilbert came to Lin Yuan and asked, "What about your friend today?" ”

Lin Yuan smiled and said, "You come with me, I'll take you to him." As he spoke, he came to Zhang Yuanyi's room, but when he opened the door, he found that it was empty, so Lin Yuan asked the comrades who lived with him, and then he learned that Zhang Yuanyi had gone to the back kitchen.

Hilbert asked Lin Yuan in surprise, "Your friend is a cook?" ”

Lin Yuan said helplessly: "No, he is a madman. Lin Yuan took Hilbert to the back kitchen, only to see Zhang Yuanyi cutting shredded potatoes, and there was a balance on the side, Zhang Yuanyi said to himself while cutting: "Will the thickness of shredded potatoes affect the taste?" ”

Lin Yuan coughed lightly, Zhang Yuanyi raised his head to look at Lin Yuan and Hilbert, and said enthusiastically: "You guys sit down, you're welcome." ”

Lin Yuan glanced around, either pots and pans or potatoes and turnips, how could there be a place to sit! Lin Yuan said helplessly: "Hurry up, we still have important things to say." ”

Zhang Yuanyi wiped the potato juice on his hands, returned to the house with Lin Yuan, and as soon as he entered the room, Hilbert put the napkin in front of Zhang Yuanyi and said, "Look, this is the result of my calculation, and I have circled the twin primes." ”

Zhang Yuanyi nodded slightly, and Hilbert asked, "How do you know these numbers?" Are there also people in China who are engaged in mathematical research? ”

Lin Yuan said with a smile: "Of course, we have established a university in Lushun, and there are many people engaged in scientific research, would Mr. Hilbert be willing to come and teach with us?" ”

Hilbert shook his head and smiled, "How can this work?" China is so far away, my wife and children are in Germany, we can't go. ”

Lin Yuan said: "You don't have to worry about family members, as long as you can come to teach here, we will definitely arrange your family properly." ”

Hilbert shook his head and smiled: "Academic research needs an atmosphere, and now the academic atmosphere in Europe is very good, and we have regular exchanges with scientists from other countries. ”

Lin Yuan hurriedly said: "Who said that we don't have a good academic atmosphere? We still have a lot of great people working on mathematics, so let me tell you about a few excellent results, how about that? ”

Hilbert nodded lightly and said, "Please speak." ”

Lin Yuan smiled: "You must know the Goldbach conjecture, our proof is very close. ”

Hilbert said, "Can any of you prove the Goldbach conjecture?" I don't believe it, it's been a lot of years, and no one has been able to prove it, I'm sorry, I wouldn't believe it if you didn't show me the process. ”

Lin Yuan smiled: "No problem! Then he turned his head to Zhang Yuanyi and said, "Comrade genius, prove the Goldbach conjecture to Hilbert." ”

Zhang Yuanyi smiled and said: "What are you kidding, Chen Jingrun's old-timers' proof results are only the closest, but he didn't prove the conjecture in the end." ”

Lin Yuan said: "That's okay, you can show him the proof of Chen Jingrun's seniors." ”

Zhang Yuanyi said: "I won't! ”

Lin Yuan asked in surprise, "How can you not?" Don't you often tell me that you are proficient in mathematics and physics? ”

Zhang Yuanyi said helplessly: "Mathematicians have long been uninterested in Goldbach's conjecture, so I don't bother to get it, let me ask you, do you want me to show him the results of the proof, do you want to impress him, and then get him to China?" ”

Lin Yuan nodded, and Zhang Yuan smiled and said, "Then this is too simple, you look at me." With that, Zhang Yuanyi sat down in front of Hilbert, picked up paper and pen, wrote a large number of symbols and equations on a piece of paper, and drew a few coordinate systems underneath, and a few lines on it.

Zhang Yuanyi finished writing quickly, confidently handed the piece of paper to Hilbert, and then turned back to Lin Yuan and smiled: "This is what mathematicians really care about - Riemann conjecture, after years of research, I found that once this problem is solved, Goldbach's conjecture and twin primes will be solved, so to speak, the solution of this conjecture will bring a revolution to mathematics!" ”

Lin Yuan thought to himself: "This achievement is so important, it must be able to impress Hilbert." Unexpectedly, Hilbert's face on the other side became more and more ugly, and he suddenly threw the paper aside, and then turned around and left.