A question about four dimensional space 20

This is not Einstein's theory of relativity, which does not take time into account.

Those of us who live in three-dimensional space cannot imagine what four-dimensional space is like, and can only deduce the difference from three-dimensional to four-dimensional by imagining the difference from two-dimensional to three-dimensional.

For example, in 2D there are two small birds moving in opposite directions and bumping into each other. At this point, they can only fly up (or down) to avoid being hit. And when these two birds live in three-dimensional space, they can choose to fly in all directions (up and down, east, west, north and south), which is easier to avoid.

In three-dimensional space, object contact is based on surfaces, and there are six sides separating the inside and outside of the three-dimensional safe, and the thief will inevitably touch at least one face, and must break through it to enter the interior; The four-dimensional space uses the body as the unit of contact, and the surface is no longer a limitation, but a basic element, and the thief can break through the limit of the surface and directly reach the inside of the safe.

The teacher wants to train your thinking skills.

A two-dimensional plane where only two coordinates can locate any point. Such as Cartesian coordinate systems.

A circle in two-dimensional space, and the creatures on this plane cannot enter without breaking this circle;

Three-dimensional, three coordinates can locate any point.

But we who live in three-dimensional space can easily enter that circle, because we only need to pass through another plane, and we are successful!

What about thieves in the four-dimensional space? By analogy, think for yourself and think about ......

The safe of the four-dimensional space is generally surrounded by eight three-dimensional spaces, and the thief is a three-dimensional creature, and there is no "thickness" in the fourth dimension.

The so-called four-dimensional space is to add the dimension of time, so it is of course easy to open the safe through time travel.

As Doyouwannasee said, in the four-dimensional space, the inner and outer spaces of the three-dimensional box are connected by the fourth dimension, and are not separated by the six sides of the three-dimensional box.

Living in a three-dimensional world is impossible to imagine a four-dimensional space, but a thief in a four-dimensional space can easily open a three-dimensional safe.

For example, moving the safe and standing in the position of the safe is equivalent to opening a "four-dimensional safe".

He has time.

Of course it is easy to pull.

The fourth dimension is time, and time is constantly changing.

Four-dimensional space, also known as "Euclidean four-dimensional space", is a standard Euclidean space. It is a mathematical concept that can be extended to the n-dimension; The fourth dimension of four-dimensional space refers to the dimension of space with the same properties as x, y, and z.

In physics and mathematics, a sequence of n numbers can be understood as positions in an n-dimensional space. When n = 4, the set of all such positions is called a four-dimensional space. The four-dimensional space is different from the three-dimensional space that people live in because there is one more dimension.

Axial symmetry of four-dimensional space.

For four-dimensional space, it is generally accepted that space is axisymmetric, or centrally symmetrical. For example, if a person in three-dimensional space enters four-dimensional space and "rotates" it in a proper way and then returns to three-dimensional space, then he will be 'axisymmetric' (which is of course not possible in three-dimensional space, unless a three-dimensional version of the Möbius strip is used). Of course, since no one has entered the four-dimensional space, this is only an analogy from the two-dimensional space and cannot be verified.

But the idea of the timeline and the phenomenon of the moment of disarray of time and space are consistent with this.

A figure from a two-dimensional space cannot be symmetrical in two-dimensional space, but when entering three-dimensional space, it can be flipped back to two-dimensional space, and symmetry can be achieved, because it cannot be flipped in two-dimensional space, only rotated or translated. Therefore, we can speculate that the three-dimensional object enters the four-dimensional space, and then returns to the three-dimensional space, and the object may be "axisymmetric".