In his paper Electromagnetic phenomena in a system moving with any velocity smaller than that of light, Lorentz ( 1904 ) was following the suggestion of Poincaré and attempted to create a formulation of Electrodynamics, which explains the failure of all known aether drift experiments, i. e. the validity of the relativity principle.

In his paper Electromagnetic phenomena in a system moving with any velocity smaller than that of light ( 1904 ) Lorentz attempted to create such a theory, according to which all forces between the molecules are affected by the Lorentz transformation ( in which Lorentz set the factor l to unity ) in the same manner as electrostatic forces.

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