# Special relativity

1. Mar 21, 2012

### Lizwi

In Lorentz transformation, where does factor Gamma $\frac{1}{\sqrt{1-\frac{v^{2}}{c^{2}}}}$ comes from?

2. Mar 21, 2012

### clamtrox

It comes from the fact that you want an inverse transform to exist. So if I call L(v) my Lorentz transformation, then when I require that L(-v)L(v) x = x, this fixes the "normalization".

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