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The principles of Einstein's relativity


The laws of physics do not change when you move from an inertial reference to another;
the speed of light in the vacuum (c) is the same for any observer, stationary or moving, independent of the speed of the source and is the maximum speed that can be reached.
At the beginning of the 20th century. Einstein replaced Lorentz's transformations with Galileo; in them the square root of (1-v2 / c2) appears. When the velocity v of the body is far from c, the square root is equal to 1 and virtually the Galileo transformations are valid, but when it is near AC, the root value increases and even approaches zero: time is dilation and space contracts, losing the characteristic of absolute magnitudes.

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