Mathematical theories are based on axiom systems. These axioms are arbitrary statements, postulates. The theory of relativity is built purely mathematically on several postulates. There are two basic postulates: 1. All physical phenomena proceed in the same way in all inertial reference frames (IFR). The inertial reference system (IRF), however, is also postulated. This is such a system, relative to which the object, not subject to external influences, moves uniformly and rectilinearly. Any frame of reference moving uniformly and rectilinearly relative to a given inertial frame is also an IFR. 2. The speed of light in a vacuum is the same in all inertial reference frames. This is the key postulate of the Special Theory of Relativity. According to him, time supposedly flows in different ways in different frames of reference. [BUT. Einstein, 1965, T.I, p.418]. According to the special theory of relativity (SRT), in conventionally taken for a moving frame of reference, in comparison with a conventionally stationary system, time slows down [A. Einstein, 1965, T.I, p.185; M. Born, 1972, p. 250].
The principle of constancy of the speed of light and the principle of relativity are in no way compatible with the concept of absolute time, or the absence of such a phenomenon as physical time. Only if time is not only a physical object, but also an object that changes under the influence of other objects, then the principle of constancy of the speed of light and the principle of relativity in the formulas of “theories of relativity” are combined. When it comes to inertial frames of reference, any of them can be chosen as a fixed frame of reference. It is clear that only a mathematician can accept that in any frame of reference the speed of light is the same, but even the mathematician Poincaré said a hundred years ago that the postulate of time variability can only be accepted as a conditional agreement.
In reality, there is no such object as time. For that state of the world, which we call the present, the state and arrangement of material particles that existed before it no longer exist, and the state and arrangement of material particles that can be obtained does not yet exist. That is, some processes going on in material bodies, for example, in a cesium clock, depending on the surrounding conditions (speed or gravity) faster or slower, do not mean that these objects remain in the past or go into the future relative to the observer. All these objects are in the same present, which is confirmed by the most elementary observations of their visibility and audibility, which could not have happened if, according to the theories of relativity, they scattered in time.
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