What is the math equation for time travel?

I know time travel is not possible right now but what is the math equation for the speed of light?

You mean the physics equation?E = mc^2 ---> Einstein's general theory of relativity equationwhere E = Energy, m = mass, c = speed of light.Also, c = f * lambda, where c = speed of light, f = frequency of light, lambda = wavelength I hope that helps. ILoveMaths07.

The special theory of relativity relates more to light