"No."

Lü Yongchang denied Lin Yongnian's statement: "Klein bottles cannot exist in three-dimensional space."

"Then..." Lin Yongnian became even more confused, "Then why did you just say..."

Lü Yongchang had no complaints about Lin Yongnian's performance.

After all, humans are not born with innate knowledge.

Only by passing knowledge down from generation to generation can human civilization possibly exist for a long time in this dark universe.

So he put together a speech and tried his best to explain the mystery to Lin Yongnian.

"gravitational."

"As the most unique of the four fundamental forces, gravity can pass through the 1+3-dimensional hyperspace membrane in which we live and affect higher dimensions."

(1+3 dimensions refers to one dimension of time and three dimensions of space.)

“These twelve gravitational sources do not target our three-dimensional space, but a higher-dimensional four-dimensional space!” Lu Yongchang’s eyes were filled with emotion. “That’s why they appear to us as if they are arranged in a chaotic manner.”

"The locations of these gravitational sources are actually the three-dimensional projection coordinates of a four-dimensional Klein bottle!"

"Similarly, this is also the biggest flaw in our spacetime theory."

"Our spacetime theory only summarizes the laws of three-dimensional space and does not involve spacetime of higher or lower dimensions at all."

At this point, a thought suddenly struck Lü Yongchang.

"I see……"

"If the spacetime theory applicable to three-dimensional space is the foundation of a Level 6 civilization..."

"What a Level 7 civilization needs to do is to push this theory of spacetime to other dimensions!"

...

To fully grasp the spacetime theory involving four-dimensional space is unrealistic for humanity today.

But this does not mean that humans cannot directly apply this principle.

In particular, human civilization also possesses a complete set of detailed model data from a level seven peak civilization.

Once the principles of individual spatiotemporal anomalies were understood, the research on the overall structure of the fortress's main brain could proceed smoothly.

After months of intensive work by a group of academicians, the three-dimensional coordinates of numerous gravitational sources were converted to four-dimensional coordinates.

Although it was only a mathematical model, Lü Yongchang still managed to imagine what it looked like using his quantum brain.

The Klein bottles are nested together, forming a complex, stacked structure.

It was only then that Lü Yongchang suddenly realized a problem.

The fortress's main brain in three-dimensional space, which is the part of the main brain that human civilization sees, occupies less than one-tenth of the entire main brain's volume!

Most of its volume is hidden in the four-dimensional space behind it.

Like an iceberg floating on the ocean of time and space, the volume above the sea surface is only one-eighth of the entire iceberg!

Not only that.

The complexity of four-dimensional structures is far beyond that of three-dimensional structures.

Therefore, the complexity of the fortress's main brain left behind by the Tenth Empire far exceeds human comprehension!

...

The research project has made phased progress.

The moment the four-dimensional structure of the fortress's main brain was fully analyzed, the entire research project entered the next stage—developing a new generation of optical computers belonging to humankind.

Considering the health of the academicians, Lü Yongchang forcibly granted them a three-day vacation before they began the next phase of their research.

Undoubtedly, this order provoked dissatisfaction among all the academicians.

But... the objection was ineffective.

Lu Yongchang directly instructed Zero to control the research robots and throw those "stubborn individuals" who threatened to perish with the research data back to their respective rooms.

Then, he happily returned to his office with the four-dimensional architecture model of the fortress's mainframe.

Academicians are made of flesh and blood, and they can't withstand this kind of torment.

But he is not.

He can now be considered half a quantum man; he can roll.

Is there a problem?

No problem.

Lu Yongchang lay back in his office chair, carefully observing the four-dimensional structure in the holographic projection, his smile gradually turning into a solemn expression.

This is difficult.

Even if we understand the principles behind the fortress's mainframe, it would be difficult for modern human civilization to modify this mature architecture.

Human civilization's understanding of time and space is still far too superficial.

...

Two years later.

The year is 3766 in the Earth calendar.

Under Lü Yongchang's leadership, the first Super 6 optical computer was successfully developed.

Why is it called Level 6 or higher...?

Due to insufficient hardware capabilities, although the computing power of this optical computer far exceeded that of the previous generation of optical computers, it still could not reach the level of the Imperial Fortress.

Just as Lü Yongchang estimated, the four-dimensional architecture adopted by the fortress's main brain is already a very mature system. Whether it is adding or reducing gravitational sources, it is absolutely impossible to do so with the half-baked technology of human civilization.

Therefore, the new generation of optical computers still copied the four-dimensional architecture of the fortress mainframe.

Furthermore, due to the current lack of technology for generating a unified field in human civilization, Lü Yongchang was forced to reduce the size of the optical brain in order to construct its four-dimensional architecture.

Then, a new problem arose.

After the optical computer is shrunk, it can accommodate even fewer computing units.

Fortunately, the four-dimensional architecture can significantly increase the computing power of the optical computer.

Despite all this back and forth, the improvement in this super-level 6 optical computer wasn't significant.

Compared to the previous generation of optical computers, the computing power resources have only increased by 500%.

It is clearly an anomaly, stuck between level six and level seven civilizations, better than some but not as good as others.

Therefore, Lü Yongchang could only classify it as a super-level 6 technology.

The moment the optical computer was successfully turned on, Lü Yongchang once again sensed the strangeness of the technology tree space.

...

Consciousness returned to the space of the mottled technology tree.

The technology tree space trembled slightly, and a thin, translucent white line gradually extended upwards on the cursor marking the optical brain technology.

The extension is not fast.

It seems that even the technology tree system is bewildered by the technology mastered by human civilization.

This doesn't make sense!

After glancing at the thin, shimmering white line that stretched into the top layer of mist, Lü Yongchang simply sat down in front of the technology tree, tilting his head back to observe its reaction with great interest.

The vibrations in the tech tree space grew increasingly intense.

As the thin, shimmering white line was about to pierce through the mist at the top of the sixth-level technology tree, Lü Yongchang's eyes suddenly brightened.

The bug was successfully exploited?!

Could it be that he's once again managed to get a sneak peek at the technology of a Level 7 civilization?!

Whoosh!

Before he could even rejoice for long, the pale white line quickly fell back below the mist and formed an orange-yellow cursor.

A line of text slowly appeared above the cursor.

[Secondary Dangerous Technology: Four-Dimensional Optical Brain (Incomplete)]