"This big circle."

Mr. Jia is very satisfied that someone has asked this question, "We call it cognitive boundary, and within the cognitive boundary, including the known and the unknown, collectively known as the knowable world. The periphery of the cognitive boundary is called the unknowable world. According to the description of human art, outside the great circle is the other side, the other side that we can never reach. ”

Everyone understood this sentence, and many students showed disapproving expressions. Everyone is a proud Lord in their own world, and it is difficult to know a thing, which can be admitted. It is impossible to know a thing, and few people are convinced.

Seeing the students' indignation, Teacher Jia sighed a little, but it was normal. Isn't it the same with me at the beginning?

"Then let's break down a little bit of the teaching content and discuss this issue a little bit."

"Ladies and gentlemen, what is the essence of life? is a limitation. ”

"Carbon-based life is equally fragile, but silicon-based life cannot evolve autonomously. And whether it is silicon-based life or carbon-based life, it is three-dimensional life, and it will be trapped in the paradox of the ship of Theseus, which is the limitation of the nature of life. ”

What is the Ship of Theseus? Someone asked below.

"The ship of Theseus is a famous paradox of the natives of this place. A brand-new ship named Theseus one day began its endless voyage. The ship is well stocked with planks, and if there is damage to the hull, spare planks are used to replace the damaged planks. Until one day, the sailors discovered that every part of the ship of Theseus had been replaced.

The question is, is this ship still the original one? If so, there is no place in it that is the original thing, why can it be said that it is the original ship. If not, then when did it not become the original ship. This is called the Theseus paradox. ”

Many students in the conference room were lost in thought, this question has different versions in different worlds, and the meaning expressed is no different.

Maybe it's possible to make some sophistry about this, but it's hard to convince others. There is no answer to the paradox.

For example, in the world of the engineer cadet, the version of the story goes like this: there is an engineering bastard who has been wanted for tens of thousands of years. In the firefight with the garrison, he kept replacing the damaged parts on his body, replacing whatever he had on hand, and the data format in the memory bank was upgraded hundreds of times. In the end, this guy's whole body was changed and turned into a detector, may I ask if this guy is still the same bastard. If so, how could a detector be an engineering machine, and if not, when did it become a detector.

Teacher Jia didn't really expect anyone to answer, she left a few seconds just for the students to recall. Every student, in their long life and exploration, inevitably asks themselves such a question. The answers they come up with may be wrong or even ridiculous.

But these reflections themselves are the biggest gains. Who am I? The trajectory of such a question often represents the entire course of a person's life.

"There is no answer to this question."

The Engineer finally broke the silence. Even the mechanical world, known for its computing power, cannot provide a solution to this paradox.

"Don't have an answer?" Teacher Jia smiled, "Are there students here who are four-dimensional beings?" ”

"I am." The middle-aged beautiful woman who gave Hao Yun the coin just now raised her hand slightly.

"Then please tell this student what he thinks of the paradox of Theseus." Teacher Jia invited.

The beautiful woman was silent for a moment, and then said, "Actually, I can't understand this paradox, as far as I can see it......" She looked confused, "Hasn't that new ship always been there?" ”

There was an uproar in the conference room.

Teacher Jia nodded, and said in his heart, sure enough, every Zhihai is a four-dimensional creature, and the difference is only whether self-consciousness is awakened or not.

In the eyes of four-dimensional beings, the world will always be the same as the past, the present, and the future. The figurative point metaphor is like a snapshot of time flying in the sky, and it is not easy to sort out the logical lines from these fragments.

She concludes:

"Do you understand, three-dimensional life cannot solve the Theseus paradox, and four-dimensional life cannot understand why the ship of Theseus is a paradox. This is the limitation of the nature of life, because of this limitation, there are boundaries in our cognition. Still have questions? ”

No one was unconvinced this time.

"Okay, let's move on to the theoretical calculations of the occult. Before that," Teacher Jia Ling persuaded bitterly, "the male classmate in the back. ”

She motioned to Hao Yun.

"Can you please stop blowing into the ears of the girl next to me, I feel itchy when I see it."

Belch......

The conference room erupted in laughter for the first time, and Hao Yun shrank his head in disdain.

Xiaobai was so ashamed that she almost got under the table, her face was flushed, and her feet kicked her little brother hard under the table.

Two people in love, how can there be a reason to listen to the class. Even if Hao Yun wanted to be serious, Xiaobai didn't agree. Before the class lasted a minute, the two began to talk to each other, and finally simply talked about it.

Hao Yun was particularly clever, he deliberately said sweet words while hazing into Xiaobai's ears. This is a big killer, Xiaobai was amused by him, from Yongquan Crisp to Parkway. She felt that the little brother's voice was very gentle, and the smell of the little brother was particularly good. The little brother's breath was hot and burning the girl's heart, and Xiaobai immediately felt that the cat had scratched her heart, and her body trembled slightly.

Teacher Jia is a teacher and an elder, and she likes to see the younger generation fall in love - it's not middle school to prevent early love. She just looked at it and felt itchy, and kindly reminded her.

"Everyone knows cis logic very well, but trans logic only exists in mystery and is difficult to experience in reality. But we can't understand it, but we can calculate it. ”

Teacher Jia's class went to the key test point, and most of the students in the conference room listened attentively, and this small youth budding in the corner was ignored like a background.

"For cis-logic logic, look at the first set of equations. An infinite number of causes can point to the same outcome, but a definite cause points to only one outcome. Trans logic, look at the second set of formulas, a cause can get an infinite number of results, but a definite result points to only one cause......"

……

……

……

When Xiaobai and Hao Yun were studying seriously, a luxurious man with quite high clothes was walking on a narrow, but infinitely vibrant street.

It is a street that is naturally formed along the river port. On one side is the dock unloading area of the port, where brigs are docked, both sides of which are painted black. The white gunwales are painted near the lower anchor.

"Cargo over the ship's side!"

It's past ten o'clock in the morning, which is the busiest time on the pier. Rugged porters and sailors shouted trade jargon as crates of cargo were lifted out of the hold and unloaded onto the docks. Richly dressed businessmen stepped out of the big houses on the other side of the street. They judged the cargo in three or three circles, or laughed at the vulgarity of the sailors, and the money bags on their waists kept shaking with their fat bodies.

Some of the women wore turbans and baskets, some had just returned from buying food, and some carried small things to sell to passing sailors. There were some ladies who did not wear headscarves, snuggled up to the doors of some suspicious buildings, and threw winks at the sailors who came to them.

The crowd was endless, and the most carefree were the half-grown children, who used pot lids as helmets and long spoons as swords, and ran rampant through the stone-paved streets, playing games of war on horseback.

In the sky, a few flocks of seagulls circled around the top of the mast, and the sea in the distance was cloudless, and the golden sun shone on the sea.

"Ah, I'm sorry."

A half-grown girl apologizes to the gorgeously dressed man.

The little girl is wearing a maid's skirt, which is clean and tidy, and it seems that the family behind her is very educated. She carried a basket of bread she had just bought, covered with a napkin.

The girl almost bumped into someone in order to avoid the scurrying bear child. She hurriedly apologized before she raised her eyes to look at the man in front of her.

It was a handsome and tall man, in his thirties, with a clear and gentle contour on his face and a reassuring smile on his face.

He wears a pale black velvet tunic with silver tassels, a dark silver-gray cloak, and holds an obviously expensive cane in his hand. The temperament is elegant and luxurious.

The most special thing is that the man also has a lazy orange cat on his shoulder. Such a soft animal makes the temperament of a man in Chinese clothes not so sharp, but a little cute.

This realization made the girl blush, and she quickly stood up and gave the man a somewhat unfamiliar ladylike salute.

The man smiled disapprovingly, raised his black top hat slightly with his left hand, and then slowly walked past the girl.

"You don't have to be so nervous." At an angle that the girl couldn't see, the fat cat on the man's shoulder moved its mouth, "That little girl is just an ordinary person." ”

"I know, just in case."

The fat cat rubbed his paws and spoke again:

"I'm here, no in case."

"Of course I believe the Director." The man smiled and looked around like a curious tourist, "I'm just in case." ”

The fat cat sighed very humanely, and he had worked together for many years, and he knew that Ah Guang was this virtue.