Dimension is the number of abstract concepts "related" to a thing. "Related" abstract concept refers to an abstract concept that is connected by multiple abstract concepts and is related to any abstract concept that constitutes it. The number of abstract concepts that make up it is its change dimension, such as area.
The three-dimensional world is static. When the three-dimensional world changes based on time, four-dimensional space is produced. If time is regarded as an axis, any point on this axis is a three-dimensional space, that is, countless three-dimensional spaces are assembled according to the time axis to form a four-dimensional space.
Extended data
According to Einstein's four-dimensional space division, points are zero-dimensional; The line between two points is one-dimensional; The surface composed of countless lines is two-dimensional; Adding height to the two-dimensional foundation is three-dimensional; Three dimensions plus time is four dimensions. Besides, Einstein and other scientists speculated that there were higher dimensions in the universe.
This speculation is described more vividly in many science fiction novels. For example, in China science fiction writer Liu's Three-body, the unique attack mode of high-dimensional life is described.
Its principle is to throw a weapon called "two-way foil" into the space where the target civilization is located, so that the attacked civilization can quickly fall from the high-dimensional space to the low-dimensional space. Although it is only the conjecture and artistic creation of science fiction writers, it also gives us a deeper understanding of the concept of multidimensional space.
Baidu encyclopedia-multidimensional space