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But c = 1 is supposedly used as a dimensionless constant, if this is the case it should always be possible to substitute the real value of c which is m/sec into the equation and still get the same result. It turns out that this cannot be done. It cannot be done because the equation yields the square root of a negative number, this means that it is impossible to substitute the real value of the speed of light into the equation and it will always remain as c =1. This means in effect that the whole equation is a charade and has absolutely no meaning.