What exactly is "exact" (was Clean Singleton Docstrings)

[Marko Rauhamaa]

Gregory Ewing <greg.ewing at canterbury.ac.nz>:
> Physicists realised that nearly a century ago, and no
> longer use the idea of a velocity-dependent mass.

   Roche states that about 60% of modern authors just use rest mass and
   avoid relativistic mass.

   <URL:
   https://en.wikipedia.org/wiki/Mass_in_special_relativity#Controversy>


Marko