Chapter 443 (1/2)

Chapter 446

”let's hand in these nine.” The student who was in charge of the record flipped through the records and said to them.

”Well, nine is absolutely enough. If I can't take it out in the first night, even if it's cold outside, I can't take it out. ” Another nodded.

”Cheng Nuo, what do you think?” The two reached an agreement, but the final decision was left to Cheng Nuo.

Cheng Nuo pondered for a few seconds, ”time is enough, add a few more, I always think nine is not safe.”

See two people want to speak, Cheng Nuo hastened to say before this, ”although the proof of the new direction is not available, but only the distortion of origi's proof method, it is not difficult.”

Both of them were overjoyed at the same time.

Although in their opinion, the nine proofs are enough to crush other schools, they have no reason to refuse if there are more.

No one will be too many!

Half an hour left in the last five minutes, Cheng Nuo saw that many students in the school had begun the final struggle.

Cheng Nuo doesn't know how many proof methods they have worked out. In line with the idea that lions fight rabbits with all their strength, Cheng Nuo is not prepared to keep any hands.

”There are many varieties of originald's proof, but they do not change without their origin. The rest is to multiply a series of integers and do some addition and subtraction proof. I'll just say two

If there are only a finite number of prime numbers P1,..., PN, let n = P1 ··· PN, then all PI (I = 1,..., n) are prime factors of n. Since P1,..., PN are all primes, and one of them must be a prime factor of n-1. Let it be pr (1 ≤ R ≤ n), then PR is the prime factor of N and N-1 at the same time, which is also the difference between them - that is, 1, but this is impossible, so there are infinite primes. ”

”The other one is simpler. The prime factor of n! + 1 must be greater than N. otherwise, if 1 is divided by n! + 1, it is impossible to be a prime factor. Since n is arbitrary, no matter how many primes have been found, a larger one can be found. Therefore, there are infinitely many primes.”

Cheng Nuo side said, the classmate Shua Shua on the paper.

After recording, from the beginning to the end, checking back and forth several times, and finding that there was no error, the time of 30 minutes just passed.

Mr. Edward, with his hands behind his back, came out of a tent. ”When the time is up, you will send a representative to give me the proof method you have explored. I will judge whether the method is correct or not, and list the ranking according to the number. The same quantity, quality first. ”

”Remember, don't forget to write the name of your school. I'll take a while. You start your campfire dinner and fill your stomach. I'll announce the results after dinner. ”

After collecting the answers from 15 schools, Edward hurried back to the tent with his neck locked and teeth shivering.

After a few seconds of silence, the young people around the campfire took out their food and began their dinner.

The atmosphere of the bonfire dinner was supposed to be happy and noisy, but it was dead at the moment. Each of them had a worried look on his face, and his heart was both expectant and nervous.

That kind of mood is no different from that when I was waiting for the score to be released in high school.

Eating delicious food, but tasteless. From time to time, I looked at Mr. Edward's tent.

Of course, one school is an exception.

Cheng Nuo is sitting on the grass with a big fat goose in his arms. His hands are full of oil and he is chewing.

The other two people are also eating with relish, completely do not see like the rest of the full face of worry.

”Chengnuo, this is Hamon ham, our local product. Try it!”

”This is the best steak. It's done. Try it, Cheng Nuo.”