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Deng Da squinted his eyes and said, "What does consensus say?"

"For example, the two of us have something to meet face-to-face, and we use text messages to agree on the time and place of meeting tomorrow. However, both of us have precious time, and we will only show up when we are sure that the other person will be able to go.

You text me and say, "We'll see you tomorrow at 10:00 in Room 109 of the Jiangda Chemical Building." However, it is not uncommon for text messages to be lost. To be confident that I learned of this, you added: Please reply if you receive it. ”

"Phew, I'm not going to meet you. Deng Da took a sip, some smiles rippled on his little face, obviously he also found it very interesting, and couldn't help but accept Liu Chen's teaching method very much, this is not easy, people have been self-taught since childhood, and now they are the most annoying teacher talking nonsense on the podium, wasting time. "Sorry, I know it's an example, you continue. ”

Liu Chen paused and continued: "After I received the message, I immediately replied: I have received it, and I will see you at 10:00 tomorrow. However, I also have my own concerns: don't you only go after confirming that I'm going? In case you don't receive my confirmation message, don't you make me wait in vain if you don't show up? ”

"It's really long-winded, okay, okay, I won't bother you anymore, I'm just the most annoying waste of time, sorry. ”

I really haven't seen such an anxious girl, Liu Chen continued: "After you receive the confirmation text message, you will naturally reply: Received the confirmation letter. But you have new concerns. ”

Deng Da hurriedly said: "I will think, if Liu Chen does not receive my reply, he will definitely worry that I will not go because I did not receive his reply, so will he not go because of this?" In order to make sure that you received a reply, I also added at the end of the text message: Please reply if you receive it." The process continues, apparently endlessly. ”

"Clever, the result is that the two of us have been confirming each other's information, but we have never been able to reach such a consensus: we will both arrive at Room 109 of the Jiangda Chemical Building at 10:00 tomorrow. ”

"That's not easy, can't I just give you a call?"

"This is indeed the best solution to the above dilemma, what is the difference between calling and texting, so that the two of us can solve the problem at once? The main reason may be that the call is online, and the text is offline. When you talk on the phone, everyone can be sure that the other person is listening, and so on, so that anything they say will immediately become a common understanding: not only do I know, but I know you know, and I know you know I know......"

"Rory, let's get down to business, I understand. Dunda was very anxious, and his eyes narrowed even tighter.

Liu Chen said directly: "The archmage announced in public that there is at least one blue eye on the island, which is to let everyone know this, and let everyone know that everyone knows this, and it will be nested infinitely like this." This news has become everyone's consensus, what will happen?"

"Let's say there are only two blue eyes on the island. Both of them could see that the other had blue eyes, so they both knew that 'there is at least one blue eye on the island'. However, since the mage did not appear, neither of them knew if the other knew about the blue eyes on the island. So, by the next day, the previous reasoning could not be continued, and everyone thought to themselves that it was entirely possible that the other party did not commit suicide because the other party did not know that there were blue eyes on the island. ”

Oh, Deng Da suddenly brightened up and shouted, "I see." After speaking, he also felt embarrassed, and whispered: "You continue." ”

"Similarly, if there are three blue eyes on the island, then unless they all know, everybody knows that everybody knows that there are blue eyes on the island, then the reasoning on the fourth day is not valid, and on the third day, some people will think that the two men did not commit suicide just because they didn't know that the other person also knew that there were blue eyes on the island. Continuing to expand to the 100 blue-eyed case, you'll find that 'knowing each other' has to be nested 100 layers in order for all reasoning to go smoothly. ”

Actually, the conditions for this topic are not complete. All the people on the island know these terms and rules very well, and they should be changed to: These conditions and rules are the consensus of all the people on the island, or rather: all the people on the island know the above conditions and rules, and everyone knows that everyone knows them, and so on and so forth. If this condition is not true, the reasoning just now is not valid. For example, even though everyone is infinitely smart, if you don't know that everyone else is infinitely smart, or if you don't know that everyone else knows that others are infinitely smart, the reasoning will get stuck because you didn't kill himself last night just because he was too stupid to push it out. ”

Dunda's eyes opened after hearing this, and he seemed to understand.

Liu Chen continued: "In fact, it is difficult for the human brain to imagine the assumption of this question, all people have the ability to reason, if it is realized with a computer program, it will be much clearer, which is equivalent to everyone's thinking in an infinite loop, and the sentence that the archmage said is to break the interruption of everyone's infinite loop, which will trigger a series of chain reactions. ”

Deng Da pondered, "What is the result?"

She already has the answer, just to verify.

After the archmage said that, on the 101st day, all the blue-eyed people would find out that they were blue-eyed and commit mass suicide, and on the 102nd day, the remaining 900 brown-eyed people would die because of the blue-eyed people, and they would also know that the color of their eyes would also commit mass suicide, and the final result would be the complete extinction of the island. ”

Deng Da knocked on his head, only to feel very swollen, but he was in a very good mood, "Ha, I can finally sleep well, I'm so happy." ”

After saying this, there was no more movement.

Dr. Deng didn't just stay on his lips and fell asleep directly after speaking, but he also fell into a deep sleep in a few seconds, his little snoring was very rhythmic, his big big-framed glasses were still stuck in his eyes, his palm-sized face was even smaller, his pale face was a little more ruddy, there was a sweet smile on the corner of his mouth, and his skin was very good, much like the tsundere girl in the comics, kawaii.

Liu Chen looked at her quietly, a little curious in his heart, how could she be so sleepy, and she had been very sleepy just now, as if she was holding back her sleepiness, why did she make a bed under the test bench, was it just that she loved to sleep? Mobile phone users, please browse and read, a better reading experience.