Gregory Ewing greg.ewing at canterbury.ac.nz
Thu Jul 3 06:55:17 CEST 2014

Rustom Mody wrote:
> Just as there are even some esteemed members of this list who think
> that c - a is a meaningful operation
>   where
>     c is speed of light
>     a is speed of an automobile

Indeed, it should be (c - a) / (1 - (c*a)/c**2).
Although loss of precision might give you the
right answer anyway. :-)


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