"Go again." This time Yin Feng walked in front, he walked to the door and motioned for Luo Yu to open the lock, he didn't have the strange strength of Luo Yu's guy.

Luo Yu pulled off the lock nose on the door again, Yin Feng kicked the door open, and the inside of the door was as gray as before, Yin Feng walked in front, taking advantage of the fact that someone behind him did not walk in, and observed the surrounding situation, but he couldn't see anything, the surroundings were just gray, and there was nothing special.

When Luo Yu was the last to walk in the door, the four of them were dizzy again, and when they woke up, they really returned to the restaurant.

"One more time!" Yin Feng seemed to have caught some eyebrows, and couldn't wait to take the four of them away again, this time he still walked in front, Luo Yu didn't wait for his orders, and didn't bother to open the lock first and then open the door, and went up directly with a kick, and the whole door was kicked out by him, and it flew far away in the gray space inside the door, but it didn't make the slightest sound.

Yin Feng was the first to walk in, as soon as he entered, he walked very fast, when Luo Yu walked in, Yin Feng was almost invisible, and then the four of them were dizzy again, Luo Yu desperately stabilized himself, endured the dizziness, and watched the surrounding space twist like a whirlpool, it turned into a restaurant, and Yin Feng, who he was most concerned about and worried about, suddenly appeared in front of them.

"How?" Luo Yu asked.

"It's almost confirmed." Yin Feng nodded, his face was a little solemn, this formation is not easy to handle, it is not as simple as the previous two.

"Isn't it easy to unravel?" Luo Yu saw that Yin Feng's face was not very good, and his brows furrowed.

"Do you know the Mebius Circle?" Yin Feng looked at the three Luo Yu in front of him.

"The Mebius Circle? I took science classes in preschool, and I saw it in math when I went to school. It is a paper circle made by turning a paper strip 180° and then bonding the two ends, ordinary paper circles or paper tapes are two sides, while the Mebius circle has only one side. Luo Xue searched her mind for something about the Mebius circle, she was very fond of handicrafts when she was a child, so she was more impressed by this.

"You're saying this formation is a Mebius circle?" Luo Yu was a little surprised, made the space into a McBius circle? How strong is that demon's strength in terms of space to do it?

Yin Feng nodded slowly, his brain was running fast, thinking about the solution, this formation uses the Mebius circle, so it can't be dealt with by cracking the ordinary circle in front, the direction of the ordinary circle in front is easy to identify, and it is obvious that the formation is dead and fixed to operate there, so he can crack it by cutting off the circle, but this formation made into a Mebius circle can't be like this.

Yin Feng deliberately walked two more times, on the one hand, to confirm the structure of the formation, and on the other hand, to feel the operation process of the formation.

After Yin Feng's confirmation, this formation is alive, that is to say, it is constantly moving and even changing, and it cannot be easily slashed.

For example, if you cut a Macbius circle made of paper, cut along the center line of the paper circle, the Macbius circle will become a large Macbius circle, and if you continue to cut along the middle line, it will become two Macbius circles set together.

Because the formation is constantly moving, it is difficult for Yin Feng to ensure that the position of the cut is to cut off this Mebius circle, or to turn it into a larger Mebius circle along the middle line, if it really becomes a big Mebius circle, or even two Mebius circles set together, then what will become of the space they are in, what will happen, whether they can return to the original space, this is a matter that needs to be considered, so the practice of cutting off the space is not to be taken lightly here, unless it is absolutely necessary, Yin Feng wouldn't do that, he had to come up with a way to have a greater success rate now.

……

"What the hell is that McBius circle?" Yan Shu, who has never been to school, said that he didn't understand what they said for a long time, mathematics or something is the most hateful, I didn't see his obsession when he worked in the supermarket, he couldn't even calculate the account, and in the end, in addition to eating and living almost for so long, it was still the boss who was good, otherwise he would have to pay upside down.

Yao Xixue smiled, waved her hand and conjured a note in the air, demonstrating to Yan Shu how to make the Mebius circle and some of its characteristics, and combined with her formation, she gave a general introduction.

Just as Yin Feng was worried, even if he cut it down casually, it was possible to turn the formation into a larger Mebius circle, and the space might be unstable because of this, and it was not impossible to involve them in the spatial turbulence, but the stability of this formation was excellent, even if Yin Feng used the Nether Fire, it would not be able to cut it off for a while, so if they really chose to use this faint move to fight, she would intervene in time.

"Where did you learn all this?" Yan Shu glanced at Yao Xixue, listening to what three-dimensional coordinates and what parameter equations she talked about, Yan Shu wanted to roll his eyes when he heard it, he didn't understand it at all.

"In order to be admitted to the medical university with my own ability, and to have a common language with him in the future, I studied all the junior and senior high school courses by myself, and I studied hard during college, and advanced mathematics was his favorite subject in addition to professional courses, so I ......" Because this topic made Yao Xixue think of the person who abandoned her again, her mood suddenly lowered again.

"How many follow-ups do you have in this formation?" Yan Shu saw that she was a little unhappy, so he changed the topic very intimately.

"This is the last one, I have figured it out in recent years, if I had taken control, with their current cultivation, they would have died in the formation a long time ago. But since it's him, let him experience it, even though I don't like him. Originally, there was another one behind, which was to make the space into a Klein bottle, that one was more complicated, the Klein bottle belonged to the four-dimensional space in the strict sense, there was no distinction between inside and outside the bottle, and the space formation made into a Klein bottle, even if it was with your current cultivation, it would not be able to break it if you tried your best, and you would definitely be trapped, or even trapped in it. Yao Xixue restrained the sadness and hatred in her heart, and looked at Yan Shu provocatively, it was rare that his cultivation would drop to this point, she could only look up to him before, and it was difficult to look at him at all, although she still couldn't beat him if she fought head-on now, but she could finally use her means to restrain him.

Yan Shu pretended not to see her eyes, drew a circle on the side, and tried the enhanced version of the round light technique that he had just learned with Yao Xixue, and the golden light flashed in the aperture, revealing Yan Shu's extremely handsome face at this time, but he pinched it on the left and touched it on the right, looking extremely dissatisfied.

When Yao Xixue saw that he didn't react and retracted his gaze, Yan Shu muttered in a low voice: "It's really a demon girl who knows high numbers, and no one can stop it!" ”

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