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Antonio;
Post #3 you use the absoluteness of the speed of light as and example of Lorentz invariance. If I may suggest that you state it such to clarify that it is the "measurement" of the speed of light in a vacuum that is invariant by definition.
To often students and others interpret the speed of light to be a fixed constant.
The defined method for measuring the speed of light in a vacuum will away render the same value regardless of the frame of reference and thus the measurement is invariant.
The sites you suggested are excellent but may be a little heavy for some of our younger members that have not yet entered this phase of academics.
Thanks;
Dave
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