Hi. In the attached proof for Lorentz transformation for momentum http://www.colorado.edu/physics/phys2170/phys2170_sp07/downloads/lorentz_transformation_E_p.pdf, there is this step that I don't understand:(adsbygoogle = window.adsbygoogle || []).push({});

1/√1-u'^{2}/c^{2}= γ(1-vu_{x}/c^{2})/√1-u^{2}/c^{2}

Can someone explain how they derived this? Thanks! :)

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# Proof for momentum Lorentz Transformation

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