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The Lorentz Factor, denoted by a lower-case Greek letter gamma,

It is defined by

EQN:{\gamma}=\frac{1}{\sqrt{1-\frac{v^2}{c^2}}}

where EQN:v is the velocity of a moving frame relative to an inertial reference frame and EQN:c is the speed of light.

See also Time Dilation, Length Contraction

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Further reading: http://en.wikipedia.org/wiki/Lorentz_factor

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