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As a matter of fact, according to classical mechanics, time is

absolute, i.e. it is independent of the position and the

condition of motion of the system of co-ordinates. We see this

expressed in the last equation of the Galileian transformation

(t′ = t).

The four-dimensional mode of consideration of the "world" is

natural on the theory of relativity, since according to this

theory time is robbed of its independence. This is shown by the

fourth equation of the Lorentz transformation:

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