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## Main Question or Discussion Point

It's probably way beyond me at this point, but how was the following equation derived and where did the need come from?

[tex]\gamma=\frac{1}{\sqrt{1-\left(\frac{v}{c}\right)^2}}[/tex]

I was reading a wikipedia article that mentioned it, but that was about it. There wasn't much of an explanation. Does anyone know of a good website that explains this?

Thanks for your help.

[tex]\gamma=\frac{1}{\sqrt{1-\left(\frac{v}{c}\right)^2}}[/tex]

I was reading a wikipedia article that mentioned it, but that was about it. There wasn't much of an explanation. Does anyone know of a good website that explains this?

Thanks for your help.