The scene in front of Zhou Zhen once again turned into a blacksmith shop.

The treetops of the trees are jagged like the outline of a distant mountain, and the gray layout is all around, as if it were some kind of fence with smoke.

In the vast courtyard, the smell of the furnace is blazing, and the residual warmth is still sinking into the cold of winter.

Dingdingding...... The aftermath of striking iron spread and slowly stopped like ripples.

The "four-dimensional utopia" and others who had just spoken to him had disappeared.

Zhou Zhen looked down at his body at the moment, in his field of vision, he had now recovered his body for 2127, which was a healthy adult body, with normal nutrition and sufficient strength.

It's just that he is still wearing Bo Yan's clothes.

Because the brown brown of the homespun caftan is too small and broken, and there is no elasticity, it is squeezed more ragged by the larger body at the moment, and it is damaged in many places, and it can only barely cover the important part of the body.

At this time, the old blacksmith strode forward, and behind him, footsteps kicked and stomped, and many villagers poured in from outside the courtyard, holding all kinds of farm tools in their hands, and surrounded Zhou Zhen with murderous energy.

The old blacksmith stared at Zhou Zhen with deep eyes, and said coldly: "Up!" ”

All the villagers immediately started running, reversing the blades of the farm tools and charging towards Zhou Zhen.

This scene is very similar to the previous situation.

Zhou Zhen did not hesitate, and immediately regardless of whether he was still trapped in the "ring", he raised his hand directly, and more than a dozen black and red cubes appeared in front of him in an instant.

Boom Boom Boom Boom ......

With a deafening bang, the battle ended very quickly.

Zhou Zhen quickly cleaned up all the ordinary villagers.

He then used [Plane Leap] to appear in front of the old blacksmith, stretched out his palm, and pressed the old blacksmith's arm, and at the same time, activated [Zero Distance Fear].

Suddenly, a majestic sense of fear swept towards the old blacksmith like a stormy wave, engulfing his mind completely.

The old blacksmith froze on the spot, his pupils dilated slightly, his limbs weakened, and the intense horror seized his consciousness, and he couldn't give birth to any thoughts of resistance for a while.

Zhou Zhen looked at him and asked calmly, "In this village, is everyone suffering from that 'plague'?" ”

"Ji Li, the youngest son of the village chief's family, was the first to get the 'plague'?"

The old blacksmith opened his mouth and replied in a very weak voice: "Yes, yes......"

Hearing this, Zhou Zhen frowned slightly, sure enough!

Thinking of this, he was about to continue questioning, when the old blacksmith's head exploded!

Rumble!

The red and white blood rain was sprinkled all over the sky, and the fishy sweet smell was rich in an instant.

Looking at this familiar scene, Zhou Zhen thought that he was going to return to the origin of the "ring".

But at this time, the blood and brains of the old blacksmith's head immediately turned into dense numbers, graphics, symbols, and formulas...... Like a fine rain, it quietly blends into the surrounding environment.

The next moment, everything around suddenly changed dramatically.

The entire courtyard, with everything inside, was filled with red, white, gray, and black.

A gray patch appeared under Zhou Zhen's feet, and he saw that his body was also dyed pure gray in an instant!

In front of him, separated by three color blocks, was a patch of red, and an old figure appeared in the red color block, which was the old blacksmith.

The old blacksmith was intact at the moment, and his body was also dyed red!

Zhou Zhen quickly glanced around, at this moment, the entire courtyard of the blacksmith shop, all the other colors faded, leaving only red, white, gray and black, which staggered to divide the whole scene, the boundary between colors and colors, as if the gaps between countless irregular puzzle pieces, as if turning this place into a 3D puzzle toy.

The number of pieces of the puzzle is uncountable for a while, but no matter how cracked they are, each piece of color is surrounded by a different color, and nothing of the same color is adjacent.

This is ...... four-color theorem?

Zhou Zhen was stunned for a moment, [Four-color theorem], also known as the four-color problem and four-color conjecture, is one of the three major mathematical conjectures in the world.

This question was raised by the British student Francis Goodry in 1852. Famous mathematicians such as G. Tate tried to solve this problem.

Finally, in 1976, American mathematicians Conis Appel and Walter Hanke used an electronic computer to prove the "four-color theorem".

It was also the first mathematical theorem to rely primarily on computer-aided proofs.

It is written on a flat map that can mark countries with common borders by using four colors to ensure that every two adjacent countries are painted differently without confusion. In other words, for any one flat map, as long as there are no more than four colors, you can find a way to assign a color such that the color scheme of any two adjacent areas is different.

The adjacent area referred to here means that there is an entire section of boundary that is common, and if two areas meet only one point or a finite number of points, it is not called adjacent. [Note]

Now, the "ring" seems to be definitely gone, but this [four-color theorem] ......

It's a "digital forest"!

※※※

The dimly lit, cold and damp coffin shop instantly turned into a village with strange traffic and jagged earthen houses.

At this moment, the doors of the houses were wide open, the footsteps were chaotic, and the villagers poured out of the thatched huts like a tide, clutching flat poles, hoes, and nail rakes...... Gather around the observers and the others.

The "crown eagle" of the "four-dimensional utopia" stretched out two fingers, pointed at the air in front of it, and gently pinched it, as if grasping an invisible silk thread.

Then, with a gentle force, he swept the invisible silk thread to the left.

Step, step, step......

The villagers who rushed up all passed through the left side of the five without squinting, and went straight to the empty target, and the farm tools that were originally smashed at the five people also fell on their left side, ping pong...... The smoke and dust that were smashed in the open space were everywhere, and all the attacks could not touch the five people.

The villagers who rushed over immediately noticed the problem, immediately turned back, picked up the stones and clods on the ground, and threw them at the five people with all their might.

The stones and clods of earth roared through the sky, and the moment they were about to touch the five people, the trajectory suddenly bent against physics and fell on the left side of the five people again.

Looking at this scene, the observer immediately looked at the "crown eagle" and asked in a low voice, "This is the 'dimensional line', and you are also an experimental subject?" ”

The "crown eagle" did not answer this question and walked directly in the direction from which he came.

The other two members of the "four-dimensional utopia" immediately followed.

Sammy Draxler glanced at the direction in which the three "crown eagles" left, then at the observer, bowed gracefully to the observer, and then walked in the direction of Zhou Zhen just now.

The observer stood alone, and just as he pondered where to look for "Ares", the dimensions of this area had returned to normal, and the villagers who were shouting and killing immediately rushed towards him.

The observer did not hesitate, and the figure disappeared from its place.

※※※

The courtyard of the village chief's house.

The four colors are intertwined, dividing all things.

The reality of the scene is like a holographic puzzle at this moment.

Standing in the red block, the red "Ares" roared angrily: "Kill! ”

When the words fell, Ji Li, who was standing in the gray block, all signs of life disappeared in an instant.

His whole body suddenly turned into a ball of pure gray liquid, and sank into the gray earth under his feet.

"Ares" immediately burst into a burst of wild laughter, just like the four people of Lu Xingkuan just now, the enemy in front of him was absorbed by his "Kingdom of God"!

He doesn't care who the enemy in front of him is, anyway, if Ji Li dares to blaspheme him just now, Ji Li's entire family must die!

However, at this time, Xinchun, who seemed to have been devoured by the [God of War], suddenly had a violent convulsion in his body, and then, his face, body, and clothes began to change rapidly, and in a blink of an eye, he turned into Ji Li's appearance!

Ji Li's fox had just reappeared, and in the air in front of him, a dense black and red cube appeared in an instant.

These cubes seemed to contain majestic energy, turning into powerful shockwaves and blasting towards "Ares".

"Ares" suddenly turned his head and looked at Ji Li.

In the next moment, the red and black interlaced shock waves all turned into pitch black, and then were absorbed by the black color block under Ji Li's feet.

Ji Li's whole body also lost weight in an instant, as if he had been hungry for a long, long time in an instant.

Soon, Ji Li's originally normal body turned into a shocking skin and bone with distinct bones, and his breath also weakened rapidly, and the remaining strength could not support him to stand at all, and the whole person sank into the black color blocks under his feet as if drowning.

This is "famine"!

Ares sneered and turned to look at the remaining three figures.

Ding Nu's body twitched for a while, and soon turned into Ji Li's appearance again.

Ji Li was standing in the white color block this time, and he was just about to make a move, when a strong sickness instantly appeared in the whole person, as if there were countless diseases, and he was entangled in an instant, so that he couldn't stand up at all, and fell directly into the white color block.

In the short process of his fall, Ji Li's shape was stubborn, his sick face was thick, and he was swallowed up by white color blocks in the blink of an eye.

This is the "plague"!

Immediately afterwards, Sui Bai's body, which was standing in the black color block, had another violent convulsion, and once again turned into a raccoon dog.

It's just that this time Ji Li's eyes are empty and there are no eyeballs.

He stretched out his arm, reached into the air in front of him, and touched it forward little by little, as if he was blindfolded and engaged in a game of "touching the blind".

At the same time, the black that had just been dyed on his body dissipated like a low tide, and returned to normal in a blink of an eye.

Ji Li's way forward step by step, approaching "Ares".

Click, click, click...... He quickly stepped out of the black patch and into the adjacent gray patch.

His body was still a normal color, and it was also not dyed gray.

Ji Lixi continued to move forward, and the rules of the [God of War] seemed to have suddenly lost their effect on him.

The distance between the two sides gradually approached, and "Ares" looked at this scene indifferently, and the arrogance between his eyebrows did not change at all.

At this time, Ji Li's came out of a white color block and entered the red color block.

The moment he stepped into the red patch, the yard disappeared, the pond was gone, and the hedges were gone...... All the surrounding scenes vanished.

Ji Tanuki seemed to have been suddenly transferred to a red world, and the ground under his feet was covered with cobweb-like boundaries, dividing the huge ground into various large and small, irregular parts, as if it was a huge map that had not yet been painted.

At this moment, Ji Li's feet were standing on one of the map plates, which was gradually turning white.

Ji Lixi didn't have eyeballs, he continued to "touch the blind" like a blind man, when he stepped out of the range of the map under his feet and entered another adjacent map, the adjacent map was also dyed white.

The same color appeared on the two adjacent maps, and Ji Lixi instantly returned to the original point.

At the same time, all the map sections were instantly painted in red, white, gray, and black, each of which was intertwined with each other, without any of the same colors next to each other.

The color block under Ji Li's feet was painted gray again, and his body was dyed pure gray in a blink of an eye!

※※※

Yue's blacksmith shop.

Zhou Zhen and the old blacksmith faced each other across the color block, and the old blacksmith said coldly: "Kill!" ”

When the words fell, all the signs of life on Zhou Zhen's body disappeared without a trace in an instant.

He fell headlong to the ground, his life cut off, and his thinking began to pause.

In a daze, he seemed to have come to a colorful and incomparably cheerful amusement park......

At the moment when the last shred of reason was about to disappear, Zhou Zhen reflexively focused all his attention on a set of formulas in his mind.

The next moment, his whole body disappeared from the gray color block, and appeared in a black color block five or six color blocks away from the position just now.

At the moment of entering this black color block, Zhou Zhen's vitality was instantly restored, but with the old blacksmith's gaze, his body immediately quickly withered down.

The pain of hunger gradually filled his entire consciousness, and it seemed that every cell was claming out for its hunger!

Zhou Zhen did not hesitate, and used [Plane Jump] again, teleporting into a white color block.

The feeling of hunger in his stomach and intestines disappeared in an instant, but his body seemed to be heavy all of a sudden, the feeling of disease rushed in, and his internal organs were full of pain, and it seemed that he couldn't live even a second!

"Grey is 'death,' black is 'hunger,' white is 'disease,' ......"

"No!"

"The correct words should be 'death,' 'famine,' and 'pestilence'!"

"These are the Four Horsemen ...... in the Book of Revelation in the Bible"

"The last red should correspond to 'war'!"

"'Death', 'Famine', 'Pestilence' and 'War'!"

"'War'......"

"This is not the 'digital forest' of this village!"

"This is the test subject of the 'Evening Judgment', the 'Digital Forest' of the god of war 'Ares'!"

[Note],. Scientific American[M].1997.237.10.

Chapter 171 Ares's four colors changed from red, blue, green, and black to red, white, gray, and black.

This chapter was supposed to take so long, but when Latte was setting it up at the time, I don't know if it was a brain pump or something, and set this four-color problem for Ares' digital forest......

Yesterday and today, most of the latte, I basically thought about this four-color problem.

What can be done to make the four-color problem a digital forest?

How do you write it to fit the setting of God of War?

What does the protagonist have to do to solve the digital forest of the four-color problem?

I turned over a lot of materials, read a lot of popular science, and did a lot of coloring questions, most of which were useless, all of them were a waste of time, and even many of them couldn't be understood at all......

Now I finally have a general idea, but I'm too tired to write, this kind of plot can't be written when I'm tired, it's easy to make mistakes, and the latte needs to rest......

I'm very sorry for this chapter today.

Lie flat and scold.

(End of chapter)