Now we remind, how the erroneousness of RT kinematic concepts can be proved
most easily. For the "yes-no"-type results only one of different evidences of
two observers could be true. Therefore, at least one of moving observers would
be wrong in mutually exclusive judgements. However, the situation can always be
made symmetrical with respect to the third resting observer. Then his evidences
will coincide with the classical (checked for 
) result,
and in this case the evidences of both first and second observers should
transfer to this result. However, since both the first and second observer
moves relative to the third one, all three their evidences will be different.
Owing to situation symmetry, both the first and second observer occurs to be
wrong in his judgements, and only the third, resting observer describes the
true (classical) result. Exactly in this manner the inconsistency of the
concept of time (the time is irreversible!) was proved in the modified paradox
of the twins [48,51], as well as the inconsistency of the "relativity of
simultaneity" concept [50]. (Note that the space-time diagram [33] does not
change the physics of even conventional paradox of the twins: all additional
aging of Earth's inhabitant arises suddenly (!), when the motion of an
astronaut changes at the far point and is only geometrically expressed as
the change of lines of simultaneity).
We begin the detailed analysis of relativity theory with a modified "twins paradox".