Who can talk about four-dimensional space …

Four-dimensional space is a concept of time and space. Simply put, any four-dimensional space can be called "four-dimensional space". But the "four-dimensional space" mentioned in daily life mostly refers to the concept of "four-dimensional space-time" mentioned by Einstein in his general relativity and special relativity. According to Einstein's concept, our universe is made up of time and space. The relationship between time and space is one more time axis than the length, width and height of ordinary three-dimensional space, and this time axis is an imaginary axis. According to Einstein's theory of relativity, the three-dimensional space we face in our life plus time constitutes the so-called four-dimensional space. Because the time we feel on the earth runs slowly, we won't obviously feel the existence of four-dimensional space, but once we get on the spaceship or reach the universe, when the speed of our reference system begins to get faster or close to the speed of light, we can find the change of time by comparison. If you sail in a spaceship with a speed close to the speed of light, your life will be much longer than that of the people on earth. Moreover, the fact that the clock slows down in the flying rocket also proves this point. There is a potential field here, and the energy of matter will change with the change of speed. So the change and contrast of time is based on the speed of matter. This is why time is one of the elements of four-dimensional space. What is four dimensions? Now three-dimensional space plus one-dimensional time constitutes the so-called four-dimensional space. However, this statement was suddenly broken. Why? We can consider it from two dimensions. A two-dimensional creature (if any) thinks that the so-called three-dimensional space is definitely different from the three-dimensional space we know-they will regard time as the third dimension because they can't feel the existence of this dimension. Similarly, we have now entered this misunderstanding and counted time as the fourth dimension. Maybe the four-dimensional creatures are sighing for us when they see us preaching this idea. So time is one-dimensional? In my opinion, time should be considered as one-dimensional, that is, adding N dimensions to the dimensions of multidimensional creatures to form a new M+N dimensional space, which will also help us solve some problems and deepen our understanding. There is a newer view that all dimensions are made up of time. Without time, there is no space, including the most basic one-dimensional space. This should be well understood, because without time, the existence of space itself is meaningless, because space-time itself is an inseparable whole. So, why can a time form different dimensional spaces? Here, we can regard time as a decomposable constant. Time can be decomposed, which may be a bit difficult to understand. However, as long as you figure it out, it is very simple. To understand this truth, we must first understand two points. The first is the inseparability of time and space. It is estimated that everyone understands that it is meaningless to talk about time without space. The second point is the diversity of time, which may be a bit troublesome to understand. In our daily life, we are all exposed to the synthesis of time, that is, a total time system composed of various time points. Maybe you think I'm picky, but I'm not. Just think about it from another angle, a result may be formed by several different reasons. Taking sports as an example, we generally observe the combination of several different sports, that is, combined sports. We can also think about time in this way. The time combination we see can be composed of the time of object movement, historical time (that is, empirical time) and other time. And exercise time, we can see it as the time up and down, the time around and the time before and after. Of course, the division methods are diverse, which constitutes the diversity of time. As for how to divide it, it depends on different situations. Part of time corresponds to a space. In this incomplete space, time plays a decisive role. We are three-dimensional creatures because there is only three-dimensional time in this dimensional space. The incompleteness of time determines the incompleteness of space. We can't know the other dimensions of space because we don't have time to move in that space. The diversity of time determines the diversity of space. At the same time, due to the different decomposition methods of time, our three-dimensional space is destined to be relative, and it can be named one-dimensional, two-dimensional, or even arbitrary-it depends entirely on different decomposition methods. Time is the key to determine the dimension, and it is also the key to determine the existence of high dimensions of low-dimensional objects. Let's take a look at the scientific statement: low dimensions are spatial defects, and they have no room for activity in the high-dimensional world. At this point, there is a problem, that is, how to find this defect. We don't think the low dimension has a certain spatial length, because we can't determine what kind of length it has, that is, we can't observe what kind of length difference with the best equipment now. So what about the future? We can't authenticate now, maybe someone will prove that low-dimensional objects really belong to high dimensions in the future. Therefore, there is no so-called spatial difference between low dimension and high dimension. So, how do we distinguish between high and low dimensions? It's simple. It takes time. Using time to explain the space of any dimension, we can also think that the reason why low dimensions are lower than high dimensions is that they have time defects and cannot feel the existence of high dimensions in time. Therefore, to understand low-dimensional or high-dimensional, we must first know the time range of their existence. The conversion between high dimension and low dimension can be realized. The reason is simple, just add or delete a time unit. However, it is easier said than done. Our concept of time is so vague that it is more difficult to realize the transformation of time in space. For four-dimensional space, most people may just think that there is a time axis on the axis of length, width and height, but most people still know little about it. An expert once made an analogy: we assume that some plane people living in two-dimensional space have only one plane concept. If you want to lock a person in a two-dimensional plane, you just need to draw a circle around him with a line, so that he can't walk out of this circle in a two-dimensional space anyway. Now we who live in three-dimensional space interfere with it. We just need to take the two-dimensional person out of the circle from the third direction (that is, the direction in which the heel axis indicates the height) and put it back to other places in the two-dimensional space. For us three-dimensional people, the situation in four-dimensional space is very similar to the above explanation. If we can overcome the four-dimensional space, it is not impossible to cross the three-dimensional space in an instant.