that is to say that the equations (10) only differ from equations (5) by the accentuation of the letters, it must be assumed:
l = 1.
Suppose now that we have η = ζ = 0, where ξ = V, ; the equations (5) take the form:
(5bis)
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We can also pose:
If the equations of motion are not altered by the Lorentz transformation, we must have:
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and therefore:
(11)
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But we have:
where:
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whence, by eliminating l², we find the functional equation: