Definer Lorentz-faktoren γ\gammaγ.
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γ=11−v2/c2=11−β2\gamma=\dfrac{1}{\sqrt{1-v^2/c^2}}=\dfrac{1}{\sqrt{1-\beta^2}}γ=1−v2/c21=1−β21, der β=v/c\beta=v/cβ=v/c. γ≥1\gamma\ge 1γ≥1, og γ→∞\gamma\to\inftyγ→∞ når v→cv\to cv→c.
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