How to distinguish one-dimensional, two-dimensional, three-dimensional and four-dimensional space?

First of all, there are four kinds of definitions:

1. Definition of one-dimensional space: One-dimensional space refers to a space composed only of points on a straight line. It has only length, no width and height, and can only extend to both sides indefinitely.

2. Definition of two-dimensional space: Two-dimensional space refers to a plane space consisting of only two elements: length and width (X axis and Y axis in geometry), and only extends to the plane.

3. Definition of three-dimensional space: three-dimensional space can refer to the space composed of three dimensions: length, width and height in daily life.

4. Definition of four-dimensional space: four-dimensional space refers to the standard Euclidean space, which can be extended to n dimensions.

Second, distinguish from four attributes:

1, the attribute of one-dimensional space: only length, no width and height.

2. The attributes of two-dimensional space: both length and width.

3. The attributes of three-dimensional space: length, width and height.

4. The attributes of four-dimensional space: three spatial dimensions and one time dimension.

Third, from the scope of application to distinguish four:

1. Scope of application of one-dimensional space: space physics and advanced mathematics.

2. Scope of application of two-dimensional space: mathematics and computer.

3. Scope of application of three-dimensional space: mathematics and physics.

4. Scope of application of four-dimensional space: quantum and cosmology.

Baidu encyclopedia-one-dimensional space