It refers to (3,5)(5,7)(9,11)...(857,859)(881,883)...etc. Two pairs of prime numbers with a difference of 2, written out as (P,P+2)
.
In 1849, Alphonse de Polignac proposed a conjecture: for all natural numbers k, there are infinite pairs of prime numbers (p, p + 2k). The case of k = 1 is the twin prime number conjecture.
In the report of the International Congress of Mathematicians in 1900, the famous German mathematician David Hilbert formally proposed it on the eighth problem and gave a specification description.
There are infinitely many prime numbers p such that p + 2 is a prime number.
This is the twin prime conjecture.
Due to its high correlation with Goldbach's conjecture, countless mathematicians have continuously challenged it in the past hundred years. The most recent stage victory was that Zhang Yitang proposed a finite interval method, proving that "infinitely many
A prime number p, p + 70 million." Then a group of great masters used his method to reduce 70 million to 246.
Not to mention proving it, even if you "find" it, it will take countless computing power.
GIMPS, which uses multiple computers to perform distributed network calculations, is specifically designed to do this job. Although it is used to find Mersenne prime numbers, there are only so many prime numbers. Who should we look for?
This shows that finding prime numbers is not an easy task.
But Yinta was able to use what she called a "nap" to casually enumerate the next 532 pairs of the largest known pairs of twin primes...
Ye Ming no longer has an intuitive understanding of this gap in computing power.
If I have to make a comparison, it is that her computing speed is probably several exponential times better than the "Nine Chapters" of the most powerful supercomputer at present, Xiaoguizi's "Fugaku".
…
"Traditional human computers use the disconnection and connection of circuits to represent 0 or 1, thereby realizing expression and calculation of binary numbers."
Ye Ming sat cross-legged on the bed, closed his eyes, and whispered in his mind.
At a glance, it looks like he is practicing some magical skill.
Yin Ta's voice came from his mind: "Are you reviewing my circuit knowledge?"
"No, I will teach you what logic gates are next."
As Ye Ming answered, he also concentrated on "drawing" a standard AND gate structure in his mind.
"Can you see it?"
"Can."
Yin Ta also drew another one repeatedly.
"The AND gate, when the input terminals A and B are in the high-level state 1 at the same time, the value of its output terminal is 1, and it is 0 at other times."
"take note of it."
"You arrange several different AND gates to get the answer."
"Look down on me." Yin Ta was like an unconvinced genius primary school student. He replied and immediately generated a long row of AND gates in his mind: "10101011001"
"Convert to decimal."
"1369"
"Yeah." Ye Ming said calmly: "Continue, next is the NOT gate, the OR gate... and the NOT gate..."
"Why are there so many doors?"
"Because... there's so much logic."
…
The door to the dormitory was pushed open silently, and Peng Xiaofei poked his head out. He saw Ye Ming sitting cross-legged on the bed, holding a book in his hand, frowning, and mumbling...
He was startled at first, and then he walked gently to Ye Ming.
He was relieved when he saw the integrated circuit design on the cover of the book.
"Ye Ming!"
"What?"
"I thought you were practicing magical arts..." Peng Xiaofei smiled and picked up the book: "You will learn this next semester, right? Are you planning to memorize it now?"
Ye Ming grabbed the book and said, "Let's get down to business."
"The real thing is, I just received a notice from the RC Organizing Committee this morning that this year, both domestic and international competitions... may be held online."
Ye Ming was stunned: "Damn it, how can we compare online?"
"It is said that they are sending a video." Peng Xiaofei also looked unhappy: "No way, it's because of the epidemic. Just forget it about Ah San, there is no need to be so serious in China..."
As soon as the epidemic was mentioned, Ye Ming knew there was nothing more to say. He frowned: "If we upload a video, we can only see which team's R2 robot is faster. There will be no confrontation at all."
Peng Xiaofei nodded: "Yes, so I wonder if this guy is targeting us on purpose..."
"...What did Teacher Chen say?"
"I just asked you to go to a meeting."
"Let's go."
…
Ten minutes later, the two appeared together in the preparation hall.
After briefly explaining the situation, Teacher Chen looked at Ye Ming with a smile: "Peng Xiaofei and I have the same opinion. It is probably that the organizing committee thought that our self-aim and defense were too buggy, so they deliberately changed it to online."
Everyone laughed together.
Of course Teacher Chen’s words were a joke.
"But now that we have decided to move it to online, it means that we no longer have to worry about sighting and defense, and can just optimize the plan of building blocks - in fact, this is what I said before, what is important in RC competitions
It’s the completion of the final mission.”
"If we regard the final completion of the building block tower as the real task of the robot, then throwing the ball and dodging the ball are just interferences with this task."
"Now, there are just no distractions, allowing us to focus on the task."
Listening to Teacher Chen's analysis, everyone nodded silently.
After Lao Chen became the instructor, he did not bring much technical support to the team. After all, everyone had completed the final upgrade at that time. What he provided more was the concept of competition. Therefore, there was finally
Facing Wuhan University, Ye Ming did not seek to defeat the opponent, but instead formulated tactics around interfering with the opponent's R2, and ultimately won the game.
I have to say, ginger is still spicy.
"Tell me, we can start from several aspects." After finishing speaking, Teacher Chen looked at everyone with a smile.
Everyone fell silent and finally looked at Peng Xiaofei.
——Peng Xiaofei is the operator of the team, and all the pressure falls on him.
Peng Xiaofei, on the other hand, "swiped" towards Ye Ming.
Seeing his friend's look for help, Ye Ming smiled and shook his head.
After thinking for a while, he said: "I think we might start with the process."
Teacher Chen immediately looked at him: "What should I say?"
"Look, everyone." Ye Ming said, turning back and pointing to the building block tower set up on the field: "Let's start with the distribution of the tower after it is knocked down, and come up with an optimal angle and intensity for hitting the tower - it's a bit similar to
…”
Before Ye Ming finished speaking, Peng Xiaofei jumped up instantly.
"I know!"
Everyone looked at him again.
Ye Ming also smiled and raised his chin: "What do you know?"
"Billiards tee off!"
"Hey, smart!" Ye Ming clapped.
Everyone also laughed immediately.
"That's right, let's tee off." Teacher Chen nodded slightly, his eyes full of admiration: "Cut out an optimal distribution that is conducive to the construction of R2, and then optimize the path of R2."
Li Dongsheng clapped his hands: "We can learn from them at Wuhan University! We are just too honest, picking up blocks one by one. This time, we will pick up three at a time!"
Teacher Chen pondered for a moment and then nodded: "But that involves changing the mission robot arm of R2. Is it possible in time?"
After hearing this, everyone looked at Ye Ming again.
Ye Ming shrugged.
Of course it's enough time, it only takes half a day.