XPost: sci.electronics.design   
   From: PointedEars@web.de   
      
   DJ Delorie wrote:   
   > nospam@de-ster.demon.nl (J. J. Lodder) writes:   
   >> As already noted else-thread photons do interact electromagnetically.   
   >> (a purely QED effect)   
   >   
   > Ah, ok.   
      
   The above is not quite correct: Photons *enable* the electromagnetic   
   interaction.  There is no such interaction without photons being involved in   
   the first place.   
      
   >> The classical equivalent of it are extra, non-linear terms   
   >> in Maxwell's equations.   
   >   
   > I remember just barely passing that course in college, so many decades   
   > ago...  TIL there's a version of Maxwell's equations that aren't   
   > dependent on constant time.   
      
   "TIL"?   
      
   Maxwell's equations do not depend on "constant time", whatever that is   
   supposed to mean.   
      
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