Steven Carlip  wrote:   
   > Finally, as a slightly more subtle point, the two elements of general   
   > relativity I listed aren't really independent.  It turns out that the   
   > Einstein field equations -- the equations that determine the curvature   
   > of spacetime in terms of its matter content -- are all you need.  If   
   > you try to write down a solution of the field equations with two   
   > separate lumps of matter, you find that there is no solution for which   
   > the lumps are stationary.  Solutions *only* exist if each piece is   
   > already moving properly in the other's gravitational field.   
      
   Just a request for clarification - are you saying it can be proven   
   that no such "both stationary" solutions can exist?   
      
   #Paul   
      
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