Loneliness is a hunger for others. So everyone wants to be in the masses, and then weave all kinds of interpersonal relationships around themselves, just to deceive themselves, to forget that they are lonely – Nietzsche

"Everything in human nature is always more complex than pure mathematics, full of countless emotions, deceptions, and uncertainties, so that the communication between people cannot be explained by the connection between a few sets and subsets, but can be used as a set to suggest a model of communication between humanity and interpersonal relationships."

"And the model is so complex that adding even any simple subset to it can dramatically change the structure of the entire model."

"It is precisely because of this that when two separate sets are forcibly placed together, in order to prevent chaos, there will be a gap between the sets and the sets, so as to protect the order, which is schizophrenia."

"The solution is to merge the two independent sets to produce a new set, and the two sets will be included as subsets as subsets."

"And if you blindly isolate each set, then in the end, you will end up with a situation that will never occur in mathematics - empty sets."

After writing the last period, Wen Yifan turned a few pages forward and wrote down its name for this story.

"Empty Collection"

After putting the notebook away, opening the notebook, and after thinking for a while, Wen Yifan added a new topic to his homework on the National Day:

What is the maximum number of subsets of size 2 from U=(1,2,3,4,5,6) such that the union of any three of them is not U?

"Teacher, are you writing a story again?" Wen Qingyu stretched his head over, "Huh? Is this a question from the teacher? ”

"Will you do it?" Seeing this, Wen Yifan smiled.

"How simple." Wen Qingyu drew a regular hexagon, then circled one of the corners, and then a fish jumped...... Rolled back to the couch.

Beautiful solution.

"Dirty Psychology." Another hand stretched out from inside the sofa pile and waved at Wen Yifan next to the desk.

"You've guessed it?" Wen Yifan smiled, worthy of being his student.

"When the teacher asked me to do my hands and feet at the door lock, I almost guessed it, and I was really the roundworm in the teacher's stomach~" Wen Qingyu said with a smile, "I can think of using hypnosis to break the game, the teacher is worthy of being my favorite master~"

"......" Wen Yifan was just silent, recalling in his mind what happened that day.

Human memory is a very magical thing, it can not only help people to recall, accurately locate some facts, but also under some deliberate guidance, bind their bodies, so that they fall into the vortex of falsehood and still do not know it.

Hypnosis is one of the most common methods.

Hypnosis here is not a kind of hypnosis that is almost witchcraft with a little literary overtones and art is higher than life, but merely a certain technique that can modify the mind of the controlled person a little.

What it contains is simple – today is yesterday.

Or, to put it more colloquially, it is to make the hypnotized person mistakenly believe that he is still living in yesterday.

Today is yesterday, then yesterday is the day before yesterday, this is the simplest logical thinking.

And Yan Feng was defeated in the memory trap set by Wen Yifan.

He first used a narrative-like technique on the train to lay out the whole incident and record it in great detail.

However, when a piece of information is very detailed, the reader often does not carefully figure out the meaning of each sentence in it, and thus becomes like a hasty reading of dates.

Even if the above record is the entire case, there will be a special person responsible for recording it carefully, and Yan Feng, as the captain, naturally did not do this.

He may read it carefully, but he doesn't pay attention to every detail.

What should I do?

Quite simply, that euphemistic proof of identity is the key message.

When a hunter is trying to find the cunning head wolf in vain, any hint of wolf next to him will make him extremely vigilant, and under this kind of attention, he will definitely read the content left by the suspected "Yunxiang Killer" several times to remember every detail.

This must include the countless detailed dates in the article.

In order to create a confusing effect, Wen Yifan constantly used interpolations, flashbacks and other techniques in that report, and kept repeating the date every time, which brought some reading difficulties for Yan Feng - his brain had to react quickly to be able to sort out and remember what each date represented.

The result of this is that in the next period of time, his consciousness will be extremely sensitive to every number he encounters, which will make him subconsciously can't help but remember the meaning of every number around him, coupled with the various psychological hints buried by Wen Yifan in the article, which is enough to produce a kind of confusion about the concept of time in his mind in a short period of time.

When the effect of this step is reached, all the foreshadowing has completely worked, and it is time for Wen Yifan to appear on the stage.

He pretended to be an old man who cared about the "9.12" murder case, and deliberately appeared in Yan Feng's eyes with the newspaper of that day, that is, September 27, and communicated with him.

This communication requires a lot of skill, a few subtle body changes, and a certain soothing tone of voice in the words, will slowly make people open their minds, so that Wen Yifan can see the chaos in it.

Then there's the content of the exchange.

In the process of communication, Wen Yifan constantly uses various details of the technique, naturally without revealing any traces of some dates again, and mixed with a series of words such as "the next day", "yesterday" and a series of words that require a little thinking to the date, which may not be in others, but I feel that the brain needs to rotate to communicate, but at this moment, Yan Feng is very sensitive to the date, and the brain that was originally disturbed by the article will be more laborious than others to think. Naturally, there are more and more flaws exposed.

At this moment, his thinking, on the one hand, was tired because of constant thinking, and on the other hand, he was gradually tired by Wen Yifan's voice, and at this moment, the hypnotic environment had been formed.

Wen Yifan, who realized this, struck while the iron was hot, and asked Yan Feng to read the time on his watch in a natural way, although he was extremely sensitive to the date, although he did not read the date, his subconscious wrote down the date very naturally.

September 27th.

After making sure that he saw this date, Wen Yifan ended the conversation, making this date the last date he saw, ending the hypnosis for him, followed by ......

"Click-"

It's the sound of the toilet door closing.

With this sound, Fang was suddenly awakened by Wen Yifan's hypnotic consciousness, Yan Feng didn't feel anything abnormal, just fought a cold war, and returned to his seat.

But in his subconscious, he has deeply remembered the date of September 27th.

Then is a person's normal memory: returned to the police station at night, applied for an arrest warrant, and went to arrest Wen Yifan early the next morning.

At this moment, it is September 28.

The moment Wen Yifan opened the door, his subconscious immediately noticed the newspaper in his hand, which was another trap planted by Wen Yifan, in order to pave an environment so that the probability of success reached 100% before complete hypnosis.

And then there'......

"Click-"

The door closed, and the sound of the crisp door lock popping up detonated the subconscious bomb in Yan Feng's mind in an instant, and the content of the bomb was - today is September 27th.

A day apart from a world of difference.

The reason why there is no doubt is because on September 26, Wen Yifan did do those things.

And if he had checked on September 27, the final outcome of the matter might have been completely different.

Unfortunately, in his consciousness, today is September 27th, and yesterday, of course, is September 26th.

As for the twenty-eighth, isn't that tomorrow?

In the end, Wen Yifan was acquitted, but he did not take it lightly - if the confusion about the date was discovered by himself in a later incident, then he would have the possibility of recalling this day.

It's small, but it's not unguarded.

Therefore, he first asked Yan Feng to send him to know the door of the house......

"Click-"

Consciousness was awakened, and his memories were back on track, completely ruling out the possibility of his discovery.

After all, it's just a little bit of a subtle change in the mind about today, and who can perceive what?

Wen Yifan quietly closed his notebook and looked out the window.

When the fake is true, the truth is also false, and there is no place for inaction.

I don't know the dream of Zhou, the butterfly dream is Zhou?

"What hypnosis often uses is the obsession in people's hearts," Wen Qingyu's voice came from behind him, "Some killers regard reputation as obsession, and some agents or special forces regard the country as obsession, which also works for other people." ”

Wang Hongjie regarded Li Xiaolan as an obsession in his heart, and even did not hesitate to construct an obsession named Li Xiaolan, so he embarked on the road of no return and self-destruction; And that Yan Feng regards the 'Yunxiang Killer' as an obsession in his heart, which will be firmly controlled by the teacher, and pass by the truth, it is by grasping the obsession or sustenance in the hearts of these two people that the teacher can easily control everything about them, so ......" Walking barefoot on the wooden floor, Wen Qingyu slowly walked towards Wen Yifan, "If someone wants to manipulate everything about the teacher, what should they do?" ”

"Or ......" Standing quietly beside Wen Yifan, Wen Qingyu looked up at Wen Yifan, "What is the teacher's obsession and sustenance?" ”

"My obsession and sustenance?" Wen Yifan chuckled, "It should be you." ”

"Teacher, it's the best!" The corners of Wen Qingyu's mouth slowly raised, revealing a sweet smile.

"It's going to be a holiday...... Wen Yifan turned his head, looked at the girl in front of him, and smiled slightly, "Where do you want to go to play on National Day?" ”

"Walking with the teacher is enough."

The years are quiet, and the present world is stable.