From: helbig@asclothestro.multivax.de   
      
   In article <8c63a839-4ab6-447e-b452-95c4774ad705@googlegroups.com>,   
   Lawrence Crowell  writes:   
      
   > On Saturday, August 18, 2018 at 11:51:11 PM UTC-5, Phillip Helbig (undres=   
   s 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.   
      
   Could you be more explicit?  It seems that you are assuming that that   
   which you wish to prove is true.   
      
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