Extinction Shift Principle� : The Details
On the Invariance of the Wave Equation
It is found that the wave equation is totally invariant under Galilean Transformations, using the principal axioms of the Extinction Shift Principle applied to all re-emissions in Euclidean Space Geometry. Abiding strictly by these axioms, while correctly applying the rules for the velocity transformations in Euclidean Space, it is herein mathematically illustrated that any observer would always derive the very same wave equation, regardless of his frame of reference.
For more details refer to the book Discourses & Mathematical Illustrations pertaining to the Extinction Shift Principle under the Electrodynamics of Galilean Transformation, page 6.