If we say that in daily life, we have a lot of coincidences. Pen, fun, pavilion www. biquge。 info then in this parallel world coincidences are inevitable.

They actually took the same flight, and coincidentally, Zifeng and the physicist were sitting in the same row, next to each other. Bai Xue and Pete sat in the front row.

Before the plane took off, Zifeng started talking to the physicist. It turned out that this old man was a professor at Harvard University in the United States, specializing in space physics. This trip was invited by the Chinese side to investigate some strange things that have happened recently. Old Professor Bai didn't say much, it was very mysterious. Bai Xue and Pete study archaeology and often learn from Professor Bai, so Professor Bai is also interested in archaeology.

It just so happened that Zifeng also liked space physics, and while chatting, Professor Bai told Zifeng about the spatial dimension.

Zero-dimensional - a point of abstraction.

It's just a point, it doesn't mean anything, it's just a simple abstract point. No size, no direction.

Zifeng nodded, very understanding.

One-dimensional - a straight line composed of an infinite number of zero-dimensional points

It refers to a straight line with an origin, such as a number axis, which means that after the origin is set, the position can be represented by a number. Figuratively, it's a straightened rope. If there is a bead on it, you can only walk back and forth on the rope. Given two zero-dimensional points and connected by a line, this is a one-dimensional world. If you are a person who lives in a one-dimensional world, then unfortunately you can't move. Because there is no concept of time, if you abandon the concept of time, then you can only move back and forth. If you commit a crime, tap two points before and after you, and you won't be able to go~ It's interesting, right~

Zifeng smiled and nodded, it's just pediatrics.

Two-dimensional, a plane formed by two intersecting one-dimensional straight lines

Two intersecting one-dimensional lines are given, forming a fork. If you are a person who lives in a two-dimensional world, congratulations, you can turn a corner, and when you come to the point where the two lines intersect, you can choose which line to follow. All the lines are intertwined in a plane, which is the two-dimensional world. There is no height in the two-dimensional world, only breadth. It is a person on a playing card who can wander around the table at will, but cannot leave the table. Here's a very interesting thing, if a two-dimensional person commits a crime, he only needs to draw a circle around him, and this circle, as a boundary, will not be broken.

"This is plane geometry, everyone knows it," Zifeng said with a smile.

Three-dimensional, a space made up of two intersecting planes

On the basis of the two-dimensional world, the height is added to form a three-dimensional world. If you are a person who lives in a three-dimensional world, then you can go and take the elevator to the third floor for a set meal or a rice bowl. If a person who lives in a two-dimensional world or takes playing cards as an example and puts them on the table, then he exists in the two-dimensional world of the table plane, and when he is taken away from the table by you, what happens? He disappears from the two-dimensional world where he was originally located, and the other playing cards in the two-dimensional world of the table will find that they have a friend who has disappeared and disappeared into their two-dimensional world. Unless you put it back on the table again.

At this point, I think it's time to talk about the weirdness of one-dimensional space. (Let's call it weird for now, because there's no concept of time travel yet.) Draw a line on the table, and that line is a one-dimensional space. Put two grains of rice on the line, and these two grains of rice are temporarily regarded as two dots, and you take one of the grains of rice, call it Mi One, and blow it lightly, blowing away from the line, and then Mi No. 2 is frightened, because suddenly he can't see his partner. His partner vanished into thin air. If you put Mi 1 back on this line, it will seem to Mi 2 that Mi 1 has disappeared out of thin air, suddenly reappeared, and is likely to appear in the distance, or behind it. In one-dimensional space, the order cannot be changed, and no one can go from front of anyone to behind him.

The reason for this phenomenon is that Mi-1 is in a high-dimensional space. From that one-dimensional line, to the two-dimensional desktop, and back to one-dimensional, I made a strange trip.

In the same way, if you draw a circle around the poker player on the table, draw the ground as a prison, and if the poker player does not cross the line, he will not escape. But if there is a three-dimensional person to help, it is simple, take the playing cards off the table, then remove them from the circle, and then put them back on the table, and the playing cards come out. It's a very simple thing, right~ But in the eyes of the poker jailer, it's a big deal. The criminals disappeared out of thin air, and then appeared outside the prison~ This is the effect of the playing cards leaving the two-dimensional space of the table, entering the three-dimensional space, and then returning to the original two-dimensional space.

Again, in order to make this clearer, let's talk about the interesting thing, which is that people in two-dimensional space cannot see things in three-dimensional space. For example, if a balloon is blown up and passes through a two-dimensional plane, the poker player can only see one point, then a circle that gets bigger and smaller, then a dot, and then no more. This is easy to understand, that is, when you cut an apple with a knife, the cut surface you see is the apple that the poker person sees.

Zifeng thought, this old man is the same as telling a story, there are two times, "What about the four dimensions?"

Four-dimensional - the story of the hard time to buy an inch of gold, time is gone.

Four-dimensional is one more dimension of time than three-dimensional. The three-dimensional world just introduced is a three-dimensional space, but this is a static space, and the four-dimensional world adds a new element to this static space - time. I believe that most women in the world hate the four-dimensional space the most, because the four-dimensional space makes the skin thicker and makes the breasts sag...... So the four-dimensional space is the easiest to understand, if we want to go back to the past or to the future world, then in fact, according to the above statement or logic, we are forcing ourselves to enter another three-dimensional world (past, future) from one three-dimensional world (present). From this, it can be concluded that robot cats live in at least four dimensions. In the eyes of the robot cat, the person seen is like a snake, one is a baby and the other is an old man. The reason why we can't see that the human image is like a snake is that we can only see the projection of a three-dimensional object in two dimensions in a two-dimensional space, and we can only see the projection of a four-dimensional object in three dimensions. I don't know if you understand this, anyway, people in the four-dimensional space can see that we are learning to walk when we are young, to elementary school, to college, to kissing others. Do something that is inappropriate for children, go to work, go to ...... And because of the low dimension, we can only see the moment. What's happening at this moment. and not to see the future. See the past.

The old professor spoke with a very humorous speech, and it is not difficult to understand it with Zifeng's qualifications.

Being able to understand the four-dimensional space is a good place to start, and if you can understand the four-dimensional space, it means that you are very likely to understand the sixth dimension. Similarly, we want to abstract the three-dimensional space (the collection of points with three-dimensional coordinates) into a single point. Time, best called the timeline, is like a straight line, on which objects in the three-dimensional world move, from birth to marriage to birth to death. This can be compared to the points in one dimension, and the order cannot be changed, just as we cannot go to the future or to the past.

There is also an interesting story, and that is the issue of jailbreaking. If you want to escape from prison, then you only need a person in the four-dimensional space, let's call it Siweige, take the prisoner out of the three-dimensional space and bring it into the four-dimensional space, and then put it back to a different position in the original three-dimensional space, so that the prisoner will disappear from the prison out of thin air, and then after a period of time, appear in another place. In other words, the instantaneous movement in some spells is to enter the four-dimensional space and then return to the three-dimensional space. It is worth noting that at this time, time passes, that is, the escape of the prisoner is not due to the return of time, but simply because of dimensional travel. If the prisoner enters the four-dimensional space at eight o'clock, the time of return must be later than eight o'clock. Don't confuse this with what I'm talking about later.

Zifeng began to struggle a little and asked: "Then if the so-called crossing takes place in the four-dimensional space, it will not change history at all, for example, if I buy a lottery ticket, if it is in the four-dimensional space, no matter how I cross, I will not win the lottery." ”

Professor Bai nodded: "You are very smart, just like the bead in the two-dimensional space, you can only walk back and forth. There are also in reality, for example: on April 4, 1946, an American Libera bomber took off and disappeared. After the incident, the U.S. military searched 500 kilometers of airspace around the site of its disappearance, but to no avail. Unexpectedly, in 1962, the "Ged" plane reappeared a few hundred meters outside the airport. The radio equipment on board the aircraft was intact. According to the analysis of the equipment, it seems that it landed on the ground that afternoon, but in fact the plane has been missing for 17 years, and in my opinion, it is nothing more than a space tour.

So, let's talk about the five dimensions.