I normally don't post a web page until I've worked out all possible problems with a concept. It led to less flames that way. But to be honest - I don't care anymore about that nonsense. So here's the page I just made http://www.geocities.com/physics_world/sr/mass_mag_field.htm In my constant pursuit of the meaning of mass in relativity I came across what at first sight appears to be a paradox (paradox - problem that really isn't there. It just seems like it). I may have a resolution to it but am as yet unsure. I think its simply that the definition regarding certain things can be meaningless in some instances (regardless of whether you refer to 'mass' as 'rest mass' or 'relativistic mass' - this paradox does not address that notion per se). If youy have any notions as to the resolution to this paradox I'm all ears. Pete ps - Ive cross posted this to another forum.