What do you mean by 2D, 3D, 4D?

Four-dimensional. Fourth dimension. Four-dimensional space.

Namely, time. Some people believe that time is also a kind of space that can be reversed and traversed under certain conditions or circumstances. Four-dimensional is the ability to instantly move from one place to another in three-dimensional space, which is not bound by time, so that time can be slowed down or accelerated

For the four-dimensional space, most people may only think that there is a timeline on the axis of length, width, and height, but most people still know little about its specific situation. However, this claim is a one-hit blow. Why?

We can think of it in two dimensions. A two-dimensional being, if any, they consider the so-called three-dimensional space to be absolutely different from our three-dimensional space – they will treat time as a third dimension because they cannot feel the existence of this dimension. In the same way, we have now walked into the misconception of time as the third dimension.

Perhaps the four-dimensional beings are sighing for us when they see us preaching this thought. So is time one-dimensional? In my opinion, time should be one-dimensional, that is, adding one dimension to the dimension of multi-dimensional organisms themselves to form a new n+1 dimensional space, and this will also help us solve some problems, and can also make us deepen our understanding of the space with a higher three-dimensional dimension.

The four dimensions in physics are actually quantity, length, temperature, and time, rather than length, width, and height as most people think. The first three dimensions are summarized by Newton, and the quantities include: mass, number, frequency, density, solubility, resistance, current, voltage, etc.; Length includes:

length, width, height, volume, area, volume, etc.; Temperature includes: heat, internal energy, mechanical energy, electrical energy, resistivity, etc. The fourth dimension of time was summarized by Einstein on Newton's basis and includes:

Specific heat capacity, speed, power, etc.

90 seconds tells you what exactly is 1D, 2D, 3D, and 4D.

1. Distinguish from the definition of the four:

1. Definition of one-dimensional space: One-dimensional space refers to the space composed of only points in a line, which only has length, no width and height, and can only be infinitely extended to both sides.

2. Definition of two-dimensional space: Two-dimensional space refers to the plane space composed of only two elements, length and width (x-axis and y-axis in geometry), which only extends to the plane where it is located.

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

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

2. Distinguish from the attributes of the four:

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

2. The property of two-dimensional space: there is both length and width.

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

4. Attributes of four-dimensional space: three spatial dimensions and one temporal dimension.

3. Distinguish from the scope of application of the four Lu Hui:

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

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

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

4. Scope of application of four-dimensional space: quantum, cosmic and cosmic science.

1. Definition of 2D and 3D.

Two-dimensional refers to the content on a plane, two-dimensional, that is, left, right, up and down, there is no front and back. The content on a piece of paper can be seen as two-dimensional, that is, there is only an area, no volume.

Three-dimensional refers to the spatial system composed of a direction vector in the two-dimensional system of the plane. Three-dimensional is the three axes of the coordinate axis, namely the x-axis, the y-axis, and the z-axis, where x represents the left and right space, y represents the upper and lower space, and z represents the front and back space, so that the visual three-dimensional sense of human beings is formed.

2. The difference between 2D and 3D.

1. As far as mathematics is concerned, the difference between two-dimensional and three-dimensional is only that the number of independent variables allowed in three-dimensional is one more than the former, and the difference between two-dimensional and three-dimensional and four-dimensional and five-dimensional, n-1 and n-dimensional is the same, and the definition of dimension can be approximately equivalent to the number of independent variables.

2. As far as physics is concerned, if the discussion of dimensions is only limited to the dimension of space, there is no two-dimensional in the strict sense of the real world (without considering time and relativity), and there are only three known spatial dimensions observed by human beings, and the so-called two-dimensional space-time is only an imaginary model or hypothetical premise.

One dimension refers to straight lines. Two-dimensional refers to the flat surface. Three-dimensional refers to three-dimensional space. The four dimensions refer to dimensions. Five-dimensional refers to the space where time is one-dimensional, hierarchical one-dimensional, and traditional three-dimensional space is unified.

One-dimensional: only length.

2D: Flat world. Only there is a length and width.

Three-dimensional: length, width, height. The three-dimensional world is the world that we feel and see with the naked eye, and the three-dimensional space is the space where the position of the point is determined by three coordinates. The objectively existing real space is three-dimensional space, with three measures: length, width, and height.

The concept of multi-dimensional space introduced in mathematics, physics and other disciplines is a scientific abstraction based on three-dimensional space.

Four-dimensional: The concept of space-timeMost of the "four-dimensional space" mentioned in daily life refers to the concept of "four-dimensional space-time" mentioned by Einstein in his "General Theory of Relativity" and "Special Theory of Relativity".

Our universe is made up of time and space. The relationship between time and space is that the structure of space is more than the three axes of length, width and height of ordinary three-dimensional space, and a time axis is an axis of imaginary values.