## Abstract

Maxwell equations in vacuum space describe the propagation of electromagnetic signals with speed \(
c \equiv 1/\sqrt {\mu _0 \varepsilon _0 }
\). Since, according to the Galilean relativity principle, velocities must be added like vectors when going from one inertial reference frame to another, the vector corresponding to the velocity of a luminous signal in one inertial reference frame *O* can be added to the velocity of *O* with respect to a new inertial frame *O*′ to obtain the velocity of the luminous signal as measured in *O*′. For a generic value of the relative velocity, the speed of the signal in *O*′ will be different, implying that, if Maxwell equations are valid in *O*, they are not valid in a generic inertial reference frame *O*′.

## Keywords

Reference Frame Invariant Mass Special Relativity Rest Frame Inertial Frame## Preview

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