"Professor, where is the irrationality of my inference?" The man with glasses didn't participate in the laughter, apparently he was concerned about the denial of his always correct self, and was ready to argue.

"What I'm saying is that one-sided reasonableness does not represent all the facts, because the truth is that all are reasonable. Your reasoning does explain the fact that there is no blood on the ground, but it does not explain anything else. For example, the ground is so clean, since the body was moved from somewhere else, why is there no trace of dragging? Dafang asked.

The man with glasses thought for a while, and suddenly said with a flash of inspiration: "Of course it was cleared, just as the murderer cleared his footprints." ”

The man with glasses spoke confidently, apparently glad that he had suddenly found evidence that would prove the correctness of his theory.

"Maybe, maybe." Dafang nodded, and then asked: "Then how much time do you think it takes for the murderer to wait for the corpse's blood to drain after committing the murder, then move the corpse here, and then clean it all up?" As a homicide, it is clear that the longer the murder is committed, the greater the risk of exposure. ”

The man in glasses began to frown, thinking about something, he was still ready to fight, he said: "The entire corridor and even the walls are so clean, it is simply spotless, which means that there may be very few people here, maybe the murderer arranged all this because he was sure that he had enough time to be impossible to be discovered." ”

"Maybe, maybe." After hearing this, Dafang nodded again, but immediately asked another question: "So, what is going on with those three left hands?" ”

Dafang's question completely stumped the glasses man and most of the students present.

The man with glasses pondered, and said in an uncertain tone: "Maybe, maybe, this is the mark of a murderer, he may be a serial killer... And the severed hand is the mark of this man's cruelty, and he ... ”

"Alright." He waved his hand generously to stop the other party from speaking.

"I am not satisfied with your answer, after I put forward the counterargument, what you have been emphasizing is only your own correctness, not really from an objective point of view, to use logical deduction, this is not what should appear in my class, in my class, quibbles should be eliminated, because it is a waste of time." Dafang frowned.

Then he said: "If the other party is really a serial killer, and he is a killer who uses people's left hands as his own mark, then does he have to cut off the left hands of three different people before every murder?" From an objective point of view, this is clearly unreasonable. ”

"But it's not impossible, is it?" The man in glasses made a final quibble.

"Yes, judging from this simple picture, it is indeed not impossible." Generously nodded.

The glasses man's complexion softened slightly.

"But." Dafang added again in a calm tone, but it was clear that there was unhappiness in his calmness, because his voice was too flat.

"But, as I said at the beginning, this is a commission I made a month ago, and since it is my experience, and I have put it in my own lecture hall, are you suggesting that I have put a neurotic act without normal logic as a case study in my own class for everyone to discuss?"

The generous words made everyone feel pressured, and the student who had made similar remarks about neurosis before unconsciously lowered his head a little

"Sit down, you won't get my 'excellent' grade at the expense of making the teacher unhappy. Okay, so is there anyone else to deduce? After saying this, he looked at the other students again.

At this moment, a very cheerful voice came from a seat closest to the lecture hall.

"Professor, if I can answer it, can you skip the credits and bring me with you the next time you handle the case?"

There is a clear anticipation in this voice, and even one can feel the eagerness in it.

Dafang frowned slightly, this student is his acquaintance, not only that, but even this kid's ancestors and fathers have a lot of friendship with him, but this can't be a reason to take him into danger.

"I can't." Dafang refused.

The generous decisiveness made the man shut his mouth and did not make any more sounds, and it seemed that the others had no desire to try.

"Please remember my words, this is what I have repeatedly emphasized in every class, I am not testing you, but I hope you will try more, so is there anyone else you want to talk about?" Look around generously.

The lecture hall was silent.

Dafang was a little disappointed, and then said: "It seems that there is no one who has the idea of giving it a try." I have to say, I'm disappointed with that. In fact, I think this opportunity to add extra points is not difficult to obtain, first of all, I have been emphasizing that similar behavioral logical inferences should start from the place of incongruity, the so-called incongruity is abnormal, unreasonable, even if it is just a little unreasonable. Because as long as it is unreasonable, there must be a reason. Keep this in mind, there must be a reason! ”

Speaking of this, Dafang paused and continued: "If you want to apply logic as a thinking tool, then you must develop the habit of starting reasoning from incongruity. This is a good habit, the habit of glasses classmates is good, but the subsequent quibbling should not be. Without further ado, let's get back to the point of incongruity. ”

Dafang's words aroused the interest of many people, and the scene of uncovering the mystery always makes people curious and expectant, even the man with glasses who was a little lost before also cheered up and looked at Dafang. This made Dafang quite satisfied, this student is not bad, and he is still a good student.

"In fact, the incongruity of these scenes has been there from the beginning, such as the spotless ground, such as the three left hands, and some of the words I said." Dafang calmly looked at the students below and began to narrate his arguments.

"First of all, the contrast in the picture is relatively incongruous, and it is naturally a spotless ground, which is very correct for the glasses classmate. As the location of a headless corpse, this place is too clean, clean and abnormal. Naturally, it can make us wonder, is this the location of the incident? ”

"And is it at all?" Dafang asked suddenly.

Most people were stunned by these words, wasn't this already overthrown by you before? Why are you bringing it up yourself now?

Dafang smiled slightly and said: "What I have overturned is only the assertion of the glasses classmate, that is, the word 'absolutely not' he said, not his arguments, almost any argument is valuable to me, and what is worthless is just subjective quibble." ”

He continued: "Is it the location of the incident? There are only two answers to this question, either yes or no. In fact, when the glasses classmate was quibbling, he still missed a possibility, he subconsciously classified the three left hands as the possession of the murderer, and did not seem to consider the possibility that these three left hands were the victim's belongings. ”

"Is it possible, then, that this was not the place of the incident, and that the three hands were actually on the victim in the first place?" Dafang narrated in an inquiring tone, and at the same time his eyes swept to the audience.

Many people began to think about it, and after a while, the student who had refuted the generosity with the argument of "neurosis" stood up and said: "Professor, I think that if this is not the place where the incident occurred, and the three hands belong to the victim, then the reason why the hands appear here can only be transferred by the murderer, but what is the point of the murderer taking it and throwing it away?" After all, these are not three props, but three severed hands, and if the murderer is there to hide the real crime scene, then why clean up the bloodstains at the location of the body? I don't think that's reasonable. ”

He smiled generously and said: "A brilliant inference, the word 'meaning' or 'purpose' is the root of the logic of behavior, and there is no logic to the meaningless and purposeless behavior." Your argument satisfies me, and I will add one credit for you. ”

The man's face was overjoyed.

"Okay, now back to the question, since no matter which side the three left hands belong to, it seems unreasonable for them to appear in places other than the place of the incident, so should we change our thinking and consider the possibility that this is the place of the incident?"

"What about the bloodstains? With the amount of bleeding from the severed head injury, it is difficult to clean so cleanly. The man in glasses spoke again, but this time he learned to be obedient, using the non-affirmative tone of "difficult".

"yes, what about the bloodstains?" The generous reaction was unexpected, and he seemed to agree with the question, nodded and repeated the question of the glasses man again in an inquiring tone.

Looking at the puzzled students, he smiled generously: "You should answer this question to me, not me to answer you." ”

The black-haired girl muttered under her breath, "It's all stupid." ”

And that cheerful voice sounded again: "It's not a real corpse, where is the bloodstain?" Such a simple truth, blind to such a good opportunity, is indeed a bunch of fools. ”

This sentence made most people feel indignant, but no one wanted to pay attention to the guy who spoke, so many people were depressed in their hearts, ready to find solace in Dafang, and prove that the other party's words were completely wrong.

And Dafang's next words naturally became the key point.

"In fact, the real crux of the problem is why there are three left hands, which is also the most incongruous part of this picture." Generously and calmly recounted.

"There is no blood on the ground of the decapitated corpse, since the reason for cleaning it up can be ruled out by external forces, then it can only be that the corpse itself did not shed blood, this is a possibility."

"What kind of corpse doesn't bleed?"

"Either the blood has long since dried up, or there is no blood in it at all."

"This corpse obviously doesn't look like a dry corpse, does that mean that there is no blood in this body?"

Ignoring the stunned students, Dafang continued, "Of course, we can't be sure that there is no blood on this basis. So let's start from this, first of all, the body without blood is definitely not human, since it is not human, then think of the three left hands that suddenly appeared next to the corpse, and then combine it with this similar high-level scientific research facility, the spotless scene, can it be completely answered? ”

In this way, it can indeed be explained, but there are few people here who appreciate it, not only are they not happy because of the generous answer, but they feel that this bastard is fooling everyone here, they feel that Professor Dafang did not put himself and the students on an equal footing at all, but concealed the most critical information, deliberately described the body of a robot as a human corpse, and completely sent them into the whirlpool of thoughts, and Dafang himself was like a passerby watching a monkey show, watching them make a fool of themselves, How can this be endured???

"Think I'm fooling you? Think I'm not fair enough? Think I'm withholding the most critical information? Dafang smiled slightly.

"Well, you can tell from your expressions that I was right, but is that really the case?" Dafang asked a question gently.

"Professor, if it's a robot's body, I think it's more accurate to use the word 'wreckage', rather than the word 'corpse', which can easily lead to misunderstanding." The man with glasses stepped forward and retorted.

The glasses man's question was very sharp, which made many classmates' eyes light up, and they felt that this was a great opportunity to refute generosity.

Dafang smiled slightly and said: "Under normal circumstances, it is indeed as you said, but this body is different, in all senses, it is extremely appropriate to use the word 'corpse' to describe it." Because in its body, it has a soul, and it is the victim of a beheading murder. ”

"If the scene of our lecture hall is the beginning of a novel, then it is normal for the readers of this novel to be unexpected, because the readers of the novel will probably not include the concept of 'living robots' within the scope of their thinking at the beginning, so it is extremely unfair for them to reason based on a picture and a piece of text, because the most critical element of 'living robots' is hidden. But not so for you. ”

"The phrase 'robots with life' is not unfamiliar to everyone, as we all know, the Lin Group has made breakthrough research results in this area 30 years ago, but it is due to many people's rejection, distrust, suspicion and fear of aliens, so it is not favored."

Some people began to think, but more people still glared angrily, and Dafang continued: "Actually, the problem is not how I describe it, because most of the puzzles have a layer of fog that covers the truth, so we can't let the puzzles accommodate us, on the contrary, we have to pursue the truth ourselves, to adapt to the puzzles." ”

At this time, the man with glasses asked again, "Professor, what you said is only one of the possibilities after all, isn't it?" Based on all this, how can we conclude that it is the truth? ”

The glasses man's words once again aroused the enthusiasm of the students, and they felt that the hope of refuting the generosity was here.

To their surprise, after hearing the words generously, he smiled happily and nodded: "It's so exciting, I have never objected to you trying to refute me, as long as you don't quibble." ”

However, he did not give a positive answer, and after motioning for the man with glasses to sit down, he generously began to narrate: "In fact, in the beginning of the words, I prompted enough information. Now think back to what I just said, 'Actually, the incongruity of these scenes was there from the beginning, like the spotless ground, like the three left hands, and like some of the words I said. ’”

"There are three things that I have come up with that feel incongruous, the first is that there is no blood on the ground, the second is the appearance of three left hands, and the third is something I said, and we guessed the first and the second together, but we didn't solve the third 'some of the things I said'."

"Now let's go back a little further and think about what I said when I first described this picture?" Dafang paused and continued: "Did you remember? My exact words were, 'This is a headless corpse, which means that this person should be dead,' and 'This means that none of the three left hands seem to be his.'" ”

Professor Dafang's words once again made most people fall into thought, and he continued.

"Without a head, it is impossible for humans to survive, and the evolution of humans on the home planet naturally does not need to grow a second, third, or even fourth left hand, so these words are absolutely certain, but the tone I use is non-affirmative 'should' and 'seem', isn't this the biggest incongruity?"

"Maybe you didn't hear that?" Dafang smiled again and looked around at the silent students, then shook his head and continued: "No, on the contrary, you all heard it, and you heard it clearly, but you took these words as a joke. ”

Many people suddenly realized, of course they all heard it, but they didn't think about it, but there were also many people who slandered in their hearts that the professor was too cunning and said the key information as a joke.

"Actually, that's still not the point."

Once again, the generous words surprised the students, and most of them began to concentrate and listen to him.

"What's really important is this sentence: 'I hope you can all make a try, stand up and tell me what inferences can be drawn from this picture, combined with what I'm saying?' As your teacher, all I want is 'some inferences' that will satisfy me, whether they are right or wrong. ”

"So from the very beginning, 'right and wrong' was not the key to this lesson, the key was to try. However, I was disappointed that all I got was a one-sided assertion and a sophistry that emphasized my own correctness, and that I had already given a credit as a reward, but I didn't even have a 'conclusion'. I'm very disappointed in this, and what I really hope is that you will keep trying, and even some seemingly fanciful inferences will not be negatively evaluated by me. ”

"But you have always thought that I was taking the school to test you, afraid that I would make mistakes, afraid of being ridiculed, and even afraid of being ridiculed by me, have you ever seen me laugh at any of my classmates?"

"A truly qualified teacher will not laugh at his students."

"And what I want you to understand is that only by keeping trying is the best way for us to really improve. Every time we make progress, we may start with mistakes, but the process and result are all the same, and we overcome ourselves again and again. It's one of the most wonderful experiences in the world. ”

After saying this, he smiled generously at the silent student, and the man with glasses who had already received the answer, and said: "Although the time has not yet come, but here it is, the above is the last second lesson I have taught you, language is also a part of logical behavior, and it is also very interesting to identify and deduce the information implied in the words." ”

"The next time I come back, it will be your last class with me, I will tell you about some of my experiences in this case, and I will also let everyone know what is the real artificial intelligence life, and I hope you will have more attempts to speak at that time."

"Now, class." After speaking generously, he picked up his notebook, clipped it under his armpit, and calmly walked out of the lecture hall.

The students, who were still sitting quietly in their seats, suddenly found that they seemed to have a little bit of real interest in the course of logic, and they felt that they wanted to listen to the last class.

No, it must be a big loss not to come.

However, the most important thing may be because there is a little bit of expectation in everyone's hearts, expecting someone to refute and overcome, who has always stood on the same line as "correct", Professor Dafang.