From: gerry@bindweed.com   
      
   In article , poutnik@privacy.net says...   
   >   
   > Dne 21/09/2017 v 08:30 Luigi Fortunati napsal(a):   
   > > Newton claims that gravity is a force, Einstein denies it: for him it   
   > > is not a force (it is something else).   
   > >   
   > > It is obvious that both can not be right: if gravity is a force, Newton   
   > > is right and Einstein is wrong, and if it is the reverse Newton is   
   > > wrong and Einstein is right.   
   > >   
   > > It can not be otherwise!   
   > >   
   > It can be otherwise.   
   >   
   > IF Einstein used space and time the same way as Newton,   
   > Newton would be right and Einstein wrong.   
   >   
   > IF Newton used space and time the same way as Einstein,   
   > Newton would be wrong and Einstein right.   
   >   
   > But as both used space and time differently,   
   > both are right within definitions and assumptions of their theories.   
      
      
   This is it, essentially.  There are some differences in the theories   
   themselves, i.e. the exact predictions of gravitational effects   
   (famously, the precession of the perihelion of Mercury is in accordance   
   with Einstein's rather than Newton's theory) - but in principle it's   
   possible to describe an identical theory in either a geometric or a   
   force-based model.   
      
   - Gerry Quinn   
      
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