From: tjoberts137@sbcglobal.net   
      
   On 11/17/22 3:54 PM, Richard Livingston wrote:   
   > [...] the rotating coordinate frame is not an inertial reference   
   > frame.   
      
   True.   
      
   A minor point: in SR all possible frames are inertial, because "frame"   
   implies the coordinate axes are mutually orthogonal, and that only   
   happens for Minkowski coordinates at rest in an inertial frame. Rotating   
   and otherwise-accelerated coordinates do not have mutually orthogonal   
   coordinate axes.   
      
   > SR only applies in inertial frames.   
      
   False. SR applies in any coordinates if the physical situation is within   
   its domain of applicability. That domain is restricted to flat manifolds   
   with the topology of R^4, which means that gravitation is absent (or at   
   least negligible).   
      
   Note, however, that standard presentations of SR give equations only in   
   inertial coordinates (within its domain). To determine what equations   
   apply in rotating or otherwise-accelerated coordinates, one starts with   
   the usual equations in inertial coordinates and applies the appropriate   
   coordinate transform to the desired coordinates.   
      
   > Velocities in a rotating frame are not real and you can't use SR   
   > with these coordinates.   
      
   That is merely repeating the above mistake.   
      
   Tom Roberts   
      
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