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A.8. Show with the aid of the Lorentz transformation
(A.28) that the quantity c²₁² — x² - y² – z² is an
invariant, namely
c²1² − (.x² + ¸‚µ‚² + =²) = (²² 1¹² — (x²² + 1,²²
1₁²
+=²²)

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