"I'll go to the first cave." Samantha quickly followed the stairs to the left, and when she reached the entrance of the cave, she barely paused, and spun in.

Lin Xuan was afraid that there would be other changes, so he immediately followed.

When he entered the cave, the man sitting on the ground had already stood up, holding a charcoal pen, and was writing on the wall of the cave.

It is an extremely long mathematical formula that contains all the unknowns that are currently commonly used by humans in mathematical calculations.

"This is the root cause of Yiqiē's disappearance." When the man finished writing, he threw away the charcoal.

Samantha looked at the forty-six stanza-long equation with a look of astonishment.

"You know what? Our human society is full of unknowns, something that cannot be seen, touched or smelled. In a complex calculation process, if there are no unknowns, the formula cannot be deduced in forward order, and can only be reversed in reverse order, which becomes doubly difficult. In ancient Chinese mathematics, it is precisely because there is no concept of unknown numbers that the level of mathematics of Chinese is lower than that of other countries in the world. Ancient warlocks were proud of knowing Bagua, Zhou Yi, and Hetuluoshu, and even felt that calculating a small nine-square grid was profound. You know, as early as 270 A.D., the ancient Greek Diophantus knew how to use letters to represent unknowns; In 1559, the French mathematician Butt began to use a, b, and c to represent different unknowns; In 1591, Veda used vowel letters such as a, e, and i to indicate unknowns; In 1637, Descartes began to use x, y, and z to represent positive unknowns in Geometry; In 1657 John Harder used letters to represent the unknowns of positive and negative numbers...... "The man gushed on and on and on as if it were in his class of higher mathematics, and Samantha was no more than a student in his class."

Lin Xuan could only stop at the entrance of the cave and wait for the other party to finish his speech before entering.

Samantha sighed: "I don't know what these theories have to do with your experience, but I do know that the case of the disappearance of Gobi poplar must not be what the national government imagined." ”

In the information, Professor Peng's whereabouts are missing and missing, and the subtext is that after death, he was buried in yellow sand or taken away by eagles, falcons, foxes and wolves to share food, and there was not even a bit of dregs left.

That was the most common idea of the people on the Gobi Desert, and as for the two lines of footprints that were divided into two, no one could explain them, so they stopped explaining them and ignored them technically.

He is not an important member of the military industrial front, and he has not shocked China and foreign countries with great inventions and contributions, so his disappearance is like a grain of sand isolating itself from the desert, a drop of water from the rivers and lakes, and a flower from the sea of flowers.

X, y, z, a, γ, and β form this six-element sixth-order equation, from which the azimuth angle and translation distance during the crossing can be calculated to within a kilometer. I'm working on a more complex formula, adding the variable time as the seventh unknown, and I get the diffuse angle, focal circle, distance, time, and no more temporal dislocations. The man said.

Lin Xuan was speechless, because the theory that the other party said was too profound, and he was actually calculating the process of human traversal. If what he said is correct, then the truth of the mysterious crossing event will soon be revealed.

"Is it Professor Peng?" Samantha asked straight to the point.

The other party's facial features, height, fat and thin are exactly the same as Professor Peng in the black and white photo, and the two are confident that they will not admit mistakes.

"Don't interrupt, besides, you won't believe me when I say it." The man replied.

Samantha hurriedly asked: "Yes or no, please sù me, nod or shake your head, in short, tell me the answer, I can save you out." Sue me quickly! ”

"Get me out? Get me out? The man pointed the charcoal in his hand at the tip of his nose, took off his glasses and wiped them, put them back on, and looked at Lin Xuan.

"Yes, get you out of here and go back to a higher scientific research institution, so that the theory you just said will see the light of day and be reborn." Samantha replied.

"You...... Hahahahaha...... "The man burst into laughter, leaning back and forth.

Lin Xuan sensed that Samantha must have said something wrong that caused the other party to laugh.

"I need someone else to help? Take me to a scientific research institute? What am I going to do? I am a dignified eunuch of the Three Treasures, seven voyages to the West, invincible, do I still need your rescue? I'm hiding here, just trying to concentrate on the 'art of shrinking the ground into inches', don't bother me, don't bother me. The man said.

Lin Xuan was completely stunned, because the name "Three Treasure Eunuchs" represents a famous figure in China's modern maritime history, the natal Ma He, who was later given the name Zheng He by the emperor, and gave the title of Three Treasure Eunuchs, leading the Chinese fleet to the Western Ocean seven times, spreading the culture and products of the Ming Dynasty to the coast of East Africa.

"If he is Zheng He, the eunuch of the Three Treasures, where did that Professor Peng go?" Lin Xuan couldn't help but ask himself in a low voice.

Samantha froze there, not knowing what to do next.

"Pick up a pen and write a formula to him." The voice came again.

Lin Xuan cheered up, walked into the cave, picked up the charcoal pen, and according to the voice's instructions, wrote a seven-element seventh-order equation on the cave wall, side by side with what the man wrote.

"What is this?" The man asked suspiciously, his lips twitching, reading the equation written by Lin Xuan.

The equation was incredibly complex, seventy-five knots.

"Great, great, I can't see it, you're really a master!" The man suddenly high-fived and shouted.

"What is this? What is this? Lin Xuan dropped the charcoal pen and asked two questions in a row.

"You say you are what you are." The voice replied.

"I want to see you." Lin Xuan used "sound transmission into the secret" to communicate with that voice.

"If you find me, you can see me, but I'm afraid you won't find me." The voice disappeared again with the words.

At this moment, the man grabbed his hair vigorously, reading the equation written by Lin Xuan over and over again, suddenly dancing with his hands and ecstatic, and suddenly feeling mournful and depressed, obviously trying his best to think about that equation.

"Let's go, let's go up and meet one of the most important people." Lin Xuan greeted Samantha.

The two of them whispered information as they walked up the zigzag staircase.

"It seems that Professor Peng's situation is more complicated than we think, traveling through time and space, soul swapping, going mad, and exhausted...... Although the intelligence department's data collectors have done a lot of work, it now seems that people outside the mountains will never know the truth about the disappearance of the Gobi poplar. Samantha said.

"The equation was written by a voice that told me to do so, and it was he we were looking for." Lin Xuan said.

The equation was far more clever than what Professor Peng had written, so as soon as he listed it, Professor Peng hit the nail on the head and was completely obsessed with it. It can be seen that the person who ordered Lin Xuan to write knew Professor Peng's situation very clearly. Then, as long as you find that person, you will be able to grasp all the situations in the cave.

He told Samantha the name of Mr. Hara, and Samantha was surprised and delighted: "Really? If he had been here, things might have been easier. We Russian spies and secret services know him, second only to 'that gentleman'. Okay, let's hurry up and find him in the shortest possible time! ”

As soon as they saw hope, both of them became brisk under their feet, and their exhaustion was swept away.

In an hour and a half, the two explored a total of fifteen layers of caves, taking a rough look at the people in each cave. Among the thousands of caves, there are more than 2,000 strangers of all kinds from ancient and modern times, from China to China, and abroad, because many caves are inhabited by more than three people, and they live in groups. The largest one, there were actually seven ancient Taoist priests holding three-foot swords and wearing blue-gray Taoist robes, who were bowing their heads and studying the ancient sword spectrum.

In one of the caves, they saw an old Indian man with hair and beard coiled around his neck, practicing in a perverse manner that resembled the Indian yoga master Brahbodila who had disappeared at Tenryu Monastery in Nepal a few years earlier.

"That should be Master Van Bodila." Samantha whispered.

Lin Xuan nodded: "It's a pity that there are still too few heroes in the world we know, everyone in this cave is not unknown, as long as their names are called, they will definitely be able to lead to a series of legendary stories." ”

Samantha also nodded: "Yes, if you let the intelligence department's tracing experts come in, you will definitely be able to match everyone's names." In that case, many secrets will be revealed. ”

Their task is to solve the mystery and reveal the secret, but it is only related to the axis of the earth, and it is impossible to expose other people's ** without restrictions and without a bottom line, which may cause chaos in the world and make it out of control.

Heroes create the world, and mortals are changed by the world. So many big people live in seclusion, so that the outside world calms down, just like the dragon lying under the nine abysses, heaven and earth can be peaceful, once the flying dragon is in the sky, the dragon is in the wild, then the world will fall into unknown chaos again.

The two of them had reached the highest point of the cave, and there was no way ahead, but Lin Xuan did not find anyone related to that voice.

"Could it be that I made a mistake in judgment and it wasn't Mr. Hara who made the sound?" Lin Xuan's heart was gradually filled with apprehension-

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