Universality of Causality Principle

The causality principle is physically
investigated in the framework of special relativity theory (SRT) and it is
proven to be absolutely valid for subluminal, luminal and superluminal signals under any
natural and/or artificial
circumstances; also Einstein's thought experiment (1907), Tolman's paradox
(1917), tachyonic antitelephone (1970) and Moller's thought experiment (1952) are re<i>-</i>examined in order to show more
conclusively that the so<i>-</i>called causality paradoxes are in fact a pure mental construction resulted from
some too<i>-</i>common misconceptions which mainly spring from the confusion
between the concepts of (relative) velocity and (relative) speed. Thus, in light of the present work, the old and semi<i>-</i>persistent
concern about causality violation by superluminal signals and its consequences
at micro and macrophysical levels may be conceptually ruled out if one
approaches the physico<i>-</i>mathematical formalism of SRT in an open<i>-</i>minded
way.