From: helbig@asclothestro.multivax.de   
      
   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.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)