Reference: Einstein’s 1920 Book
Section XIV (Part 1)
The Heuristic Value of the Theory of Relativity
Please see Section XIV at the link above.
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Summary
Lorentz transformation is a definite mathematical condition that the theory of relativity demands of a natural law, and in virtue of this, the theory becomes a valuable heuristic aid in the search for general laws of nature.
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Comments
The fact that Lorentz transformation takes the velocity of light as constant is equivalent to treating light as a point of zero inertia compared to matter that has inertia. The transformation then accounts for the effect of imperceptible changes in inertia of the material bodies on their velocity.
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