From: ram@zedat.fu-berlin.de   
      
     I have once heard that states are represented by /rays/   
     in a Hilbert space, and another time I heard that the   
     state after a pair production with a conservation law   
     was (in a certain case):   
      
   psi = 1/sqrt( 2 ) ( |+> |-> + |-> |+> )   
      
     Why is the real factor "1/sqrt( 2 )" carried along when   
     it's only the ray that matters?   
      
     Presumably, one wants to have a unit ray?   
      
     But if every other vector of the ray could just as well   
     stand for the same state, when or why is such a   
     normalization with "1/sqrt( 2 )" important?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)