"Then you must know the concept of regular polyhedra, which is named after Plato and his followers' research on them. Because of their high symmetry and sense of order, they are often called regular polyhedra."

"Different from other ordinary regular polyhedra, all the faces of a regular polyhedron are non-self-intersecting regular convex polygonal planes with straight line segments as sides. Each polyhedron has only one regular polygonal surface, and in each The same number of faces meet at the vertices, and at each vertex the sum of the interior angles of all the faces that meet will be equal."

Bi Qigu was thoughtful, recalling his limited extracurricular mathematics knowledge:

"If you're talking about a regular polyhedron, and not a regular 21-hedron, then I've heard that it's also called a Platonic solid."

"Yes."

"Then you should also know that from the point of view of collection, there are only five types of frontal bodies, namely regular tetrahedron, regular hexahedron, regular octahedron, regular dodecahedron, and regular icosahedron... In other words, from the perspective of scientific truth From the point of view, the regular icosahedron is the most limiting value of the frontal body.”

Hikigu blinked, nodded and said nothing, and continued to listen to Laimer:

"Plato spent his whole life trying to figure out why there are only five kinds of regular polyhedrons, but he failed; Descartes and Euler also tried to prove this problem, but although they gave the proof method, the method was not used in later generations. Proved to have some problems.

——It was not until the birth of Cauchy, the man predicted by both Lagrange and Laplace, that he finally solved this famous problem spanning many years in the history of mathematics. "

"Since then, we have known that in three-dimensional space, there are only these five kinds of regular polyhedra, and there will be no more and no less... As for things like regular 24-hedrons that do not exist in three-dimensional geometry, they are probably It can only be found in the higher-dimensional space in the legend.”

What Laimer said was the first time Bi Qigu heard the long-lost "scientific vocabulary" of "high-dimensional space" in the mysterious world.

He inexplicably thought of the evil god he had met in the past, as well as the green-level weirdness related to the evil god Valaka that he had seen in the abandoned school building.

The body structure of a large part of them is twisted and weird, indescribable, every detail of the body does not conform to any geometric structure, it looks profane and cannot be seen directly... Is such an existence the so-called high-dimensional figure?

In other words, can Hikigu think this way: Although not all of the evil gods and blue-level monsters he encountered in the past, some of them may be related to high-dimensional space, or even directly be creatures in high-dimensional space?

... Hikigu felt as if he was about to touch something, but there was too much fog in between, making it impossible for him to see or touch even a little truth.

Laimer spoke again. I don't know if it was because he was excited. His speech became faster and faster, and his tone became more and more high-pitched.

"However, even in the high-dimensional space that scientists speculate, there is no so-called regular 21-hedron, because if there are only 21 faces, it is neither 'positive' nor can it draw "expansion diagrams, simply There is no way to become a complete and closed whole. "

"So the 21-hedron ... is a distorted shape that doesn't exist at all."

"Doesn't exist? Then what are you looking for?"

Hikigu groaned in confusion.

He tried to imagine it. With his poor spatial imagination, he can still think of tetrahedron and hexahedron. The dodecahedron is a bit difficult, and the icosahedron is already very cumbersome. Although there is a general concept, But it cannot be constructed in the mind.

As for what the so-called 21-hedron looks like, Hikigu really lacks this imagination, he can't even imagine what it looks like!

——Because, as Laimer said, having a 21-hedron and being "positive" is beyond the imagination of a person who has received modern mathematics and geometry education.

"It doesn't exist, it doesn't exist. This is something that doesn't exist in three-dimensional space, and it may not be possible in high-dimensional space. But in the mysterious world of Iraq, there are very secret legends about it."

"In the legend, it has the concept of infinity and infinity because it broke through the maximum number limit of '20' of the icosahedron. Between existence and non-existence, making it unbreakable, unaffected by time, space, physics, and occult dimensions."

"Since the concept of 'positive' cannot be formed on 21 sides, it has the concept of unequal equality."

"In short, infinity, eternity, immortality, possibility, and unequal equality are the concepts that exist in the 21-hedron."

"How is it possible?" Bi Qigu raised his eyebrows, his heart pounding, "How could it be so powerful? Then if you get that, wouldn't you become a god instantly?"

"Of course not." Laimer shook his head, "The 21-hedron is not a prop, it's just a piece of raw material, the realization of a concept...so he can't use it directly, it can only be used as a raw material.

Of course, human's methods are limited after all, and any method that uses it may be just wasteful, unable to exert one ten-millionth of its effect. "

"Then how to use it? What can this thing be used for?"

Bi Qigu asked.

Laimer thought for a while, and said in a way that Hikigu could understand:

"If it is in the hands of a pharmacist like me, I can use the 21-hedron to try to refine the longevity medicine, and this may just be its most common usage."

"If it is in the hands of the legendary alchemist, this thing is the most top-level, most natural, highest-quality and highest-sequenced stone in the legend, which all alchemists have pursued all their lives. It can be used to refine some incredible things. thing."

"If it falls into the hands of the association, they will have an extra S-class containment item."

"If it falls into the hands of the church, they can exchange it at equal value to summon a high-ranking angel to descend to the world."

"...Anyway, it can be used in many ways, but what is interesting is that this 21-hedron cannot be used to make any props with attack or destruction effects."

Hikigu narrowed his eyes, thinking about the meaning of the so-called 21-hedron.

"So, you want this thing?"

"Yes."

Lamer readily admitted.

"What if there is no such thing in the treasure?"

"The things in the treasure, you and I will divide it into three or seven, and you will divide it into three."

Facing Hikigu's question, Laimer's decisive answer showed his determination.

"What if we find it?"

"Then I will take the 21-hedron, and everything else, no matter what, I will not take a penny."

Hikigu noticed the fanaticism in Lamer's eyes,

"You seem to care about this regular 21-hedron?"

"Frankly, I want more of it than you can imagine."

Laimer's eyes were fanatical and determined. He didn't look like a follower of the former Guardian True Sect, but rather a follower of the so-called 21-hedron.

"This is the reason why I didn't run away when I saw the arrest warrant, and even the meaning of my life is this. Don't ask me the specific reason, you just need to know, as long as I get it, even if I die immediately, I am willing! "

Hikigu saw the undisguised murderous intent and determination in Laimer's fanatical expression,

Laimer almost gritted his teeth and said as if swearing:

"But before that, I will kill anyone who prevents me from taking it! The association can't do it, even if the gods come!"

"..."

Hikigu didn't speak, just sat on the sofa and looked into Laimer's eyes, his eyes were calm and deep, making people unpredictable.

Laimer just looked at Biqigu in silence.

... This is the first time that Laimer has been so strong in front of Bi Qigu. It seems that the usually shrewd or hippie smiling person suddenly changed from head to toe.

It seems that the 21-hedron is his bottom line, his reverse scale, and his taboo that cannot be touched.

Hikigu was meditating, and the corners of his mouth slowly curled up under Laimer's gaze.

Elixir of longevity, Philosopher's Stone, S-class containment, angel descending...

Give me everything except the 21-hedron?Or [-]%?

Only children do multiple choice questions.

But I'm detective Bi Qigu, so I have to ask for them all.

……

……

Chapter 130: The Heavenly Mission Shocked; Arabian Desert

But on the surface, Hikigu couldn't say that.

"But, I refuse!" "My favorite thing is to say no to a self-righteous person like you!"

...Although it may be very pleasant to say such things, the consequences of saying them are not so pleasant.The price/performance ratio is too low to be worth doing.

Probably any momentary pleasure has a price of unhappiness, and Bi Qigu doesn't want to turn against Laimer now.

"Okay, deal."

After Hikigaya thought about it, his calm answer resounded in the elegant carriage.

He kept looking into Laimer's eyes, narrowing his eyes slightly.

He has studied the interpretation of micro-expressions in the association, and he can already initially interpret the meaning in people's eyes... What's more, Laimer doesn't seem to hide his thoughts now, and all emotions are more clearly displayed on the outside.

Whether it's firm or fanatical... Laimer's eyes are missing something.

There was no greed in his eyes.

This attracts Hikigaya's attention because it's unreasonable.

People who chase treasures are extremely fanatical and chasing them crazily, but they don't have the slightest greed for treasures. This is unreasonable and even a bit contradictory.

...It's as if this person's pursuit of treasures is not for himself.

Therefore, there are more and more mysteries about this Iraqi man.

……

"So that's the case, we have fully understood."

In Baghdad, under the long defense corridor of the air-raid shelter, Xue Nai and others listened to the report of two civilian staff in a separate room, read the relevant information, and probably knew it in their hearts.

Shi Yu frowned thoughtfully, Xia Na crossed her legs and raised her hands irritably, tapping her fingers on the table.

Yukino's eyes were firm, and Yangno's expression was meaningful. Kaguya glanced at the surveillance scene in the hall outside the transparent glass from time to time, and there was the headless carriage that Hikigu was riding on.

"Commander Ahmed means that everything here is left to them. You have come from a long way, and it is very hard to drive all day. Why don't you go to the hotel to rest for a night and come back tomorrow morning after you have a good rest."

"Tomorrow morning? How can there be tomorrow morning?" Xue Nai raised her hand, the sleeve on her white wrist slipped off, and the Patek Philippe pointer inside clearly pointed to 5:10.

"It's already five ten in the morning, and it will be dawn in a while. How can there be tomorrow morning?"

Xue Nai complained sharply, in a cold tone that could not be rejected cleanly,

"It's enough to sleep on the plane. Now, prepare a car to take us to the front line immediately."

"But……"

"What do you want?"

——This time it was Yang Nai's voice, her tone was somewhat similar to Xue Nai's just now, although the tone was not as cold as Xue Nai's, but they were all the same crisp and clear, although the tone was not high, it could not be rejected.

——It’s not Sakalski’s kind of domineering that I don’t allow you to refuse, but the tenacity that you can refuse, but your rejection will not shake my thoughts and will not interfere with my actions.

"We are not here to eat and wait to die, let alone to be domineering. We are here for the head of the Biqigu branch. According to Sakaski's order, we should fight side by side with Biqigu... so if you have any opinions, don't hesitate. mention it, but we won’t listen and it’s hard to follow through.”

"But the danger ahead is too high. Whether it's the wanted criminal Lamer driving the headless carriage, or the guardians in the jeep, the remnants of the True Sect are all very dangerous. Even if we dispatch the elite of the Iraqi Association branch Follow, it is difficult to guarantee that there will be no casualties."

The clerk who spoke was embarrassed, and said so after deliberating for a long time.

Yang Nai raised her eyebrows, she was as intelligent and experienced as she was, and she could hear something unusual from the clerical words.

"Don't you think that you dislike us for being too weak?"

"This……"

The civil servant suddenly became speechless.

That's what he meant, he just couldn't say it outright.

After all, according to the information they obtained from the Iraqi Association branch, the people in front of them were only agents of the Japanese city-level agreement branch, the lowest-level association branch, and the one with the highest resume was Yang Nai, who once served as a county-level branch The deputy chief, and the others, two of them have just joined the association not long ago.

From the perspective of everyone in the Iraqi Association branch, it is impossible to say that they do not have their own abilities, but a large part of being able to get to this position is due to the honor of the head of the Biqigu branch, who is as inexhaustible as the head of the Biqigu branch. With a branch leader who has a plan and outstanding strength, they must be very relaxed, right?

...So no matter how you look at such a lineup, you can't feel relieved, let alone send them to the front line.

Even if the people from their state-level association branches come out in full force, there is no guarantee that there will be no problems. What are your mere district and city-level branches doing? In the end, are we going to protect you or destroy the enemy?

... Strictly speaking, this kind of analysis seems to be well-founded. After all, Biqigu has really grown too fast, and it is not difficult to promote his teammates. The matter of inspectors patrolling Kyoto is indeed what these people think, and Biqigu's influence Light.

But this doesn't mean that Yukinoshita Yono, Yukinoshita Yukino, Shinomiya Kaguya, Shana, and Kasumigaoka Shiwa can be underestimated by others.

Yang Nai got angry when he heard it, his eyebrows stood upright, and his voice suddenly became higher:

"Has anyone ever told you to never underestimate anyone you see?"

"Have seniors ever taught you that in the mysterious world, if you haven't seen it with your own eyes, don't believe any material or experience on paper; if you see it with your own eyes, then don't believe your own eyes."

Yang Nai chattered endlessly, his tone gradually calmed down but with a sarcasm that was so thick that it was almost overflowing.

"No one really thinks we are weak and you are strong?"

Yang Nai has never been looked down upon so much before, and it may not be acting at this moment, and there may be a lot of real anger and ridicule.

Return to the branch of the national association, and don't look at your mysterious world in Iraq, which is a poor country with many birds and no shit. Are you worthy of looking down on us?

"cough."

Xue Nai coughed lightly, tapped the tip of the black umbrella in her hand to the ground, and made a crisp sound of "snap".

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