Positive and negative time, space and space-time inversion in five-dimensional space-time

According to Einstein's special theory of relativity, especially the statement that the clock is slow. When the speed of an object approaches the speed of light, the time around the object will slow down rapidly and the space will shrink rapidly. When the speed of an object is equal to the speed of light, time will stop and space will shrink to a point, which means the emergence of zero time and space. When the object moves faster than the speed of light, time will go backwards, which is called negative time; Space will correspondingly return to the past space, which is the so-called negative space. At this time, the object will enter negative space-time, that is, space-time reversal or space-time reversal, so that the object will realize teleportation, that is, instantaneous movement.

When we use the spatial rectangular coordinate system to represent the five-dimensional space, the spatial time is the horizontal axis and the vertical axis respectively, and the velocity is the vertical axis, thus forming the five-dimensional spatial reference system. In this frame of reference, the coordinate axis of time and space has not only a positive axis, but also a negative axis, including the origin. There is a space-time distance between time and space in the five-dimensional space reference system, that is, there is a geometric distance relationship between positive and negative time and positive and negative space (at least in the coordinate system).

We all know that the basic unit of time distance is "second" and the basic unit of space distance is "meter", so what should be the unit of measurement of time-space distance (hereinafter referred to as time-space distance)? The value of velocity vector is obtained by the ratio of space distance to time distance, and its basic unit is "meter per second" (m/s). Space-time distance is the intersection of space distance and time distance. According to the intersection law in pure mathematics, its basic unit should also be the product of two basic units, namely "meter * second" (pronounced "meter times second"). The basic unit problem has been solved, so what about the measurement problem? Because space is a series of time periods, there is a vertical intersection between space distance and time distance, which is stable with space-time distance. So in this right triangle, the time distance is a hook and the space distance is a chord, so the space-time distance is a chord. As for whether Pythagoras' law can be applied here, the measurement of space-time distance in five-dimensional space is debatable!