From: tjroberts137@sbcglobal.net   
      
   > [[Mod. note -- Actually conservation of mass and conservation of   
   > momentum are *very* closely related in relativity: they are   
   > respectively the time and space components of conservation of   
   > 4-momentum. -- jt]]   
      
   Correction: mass is the NORM of an object's 4-momentum, its energy is   
   the time component of its 4-momentum when projected onto an inertial   
   frame, and its 3-momentum relative to that frame is the 3 spatial   
   components.   
      
   Tom Roberts   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)