From: goldenfieldquaternions@gmail.com   
      
   [Moderator's note: Apologies for the delay in posting this. -P.H.]   
      
   On Saturday, August 18, 2018 at 11:51:11 PM UTC-5, Phillip Helbig (undress to   
   reply) wrote:   
   > In article <19886fb9-8614-4aee-acb1-2c1356393302@googlegroups.com>,   
   > Lawrence Crowell  writes:   
   >   
   > > Two anti-masses will repel as can be seen with   
   > >   
   > > ma = -GMm/r^2,   
   > >   
   > > where for M and m negative this equation picks up an additional minus   
   > > sign.   
   >   
   > While (if I remember Steve Carlip's comments on this correctly) this is   
   > correct, it is not obvious where the extra minus sign comes from.  The   
   > two on m and M cancel, so if you like the extra one is the one seen   
   > explicitly in the equation above.  But where---via a simple, heuristic   
   > argument---does it come from?  We can't just assume that that which we   
   > wish to prove is true and insert it for that reason.   
      
   The minus sign comes in from the left hand "ma" side of the equation.   
      
   LC   
      
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