From: jeroen@nospam.please   
      
   jurb6006@gmail.com wrote:   
   > You may have seen me rail against how the schools teach that inversion is   
   the same thing as 180 degrees out. Out of phase, by definition or etymology or   
   whatever the fuck at least strongly implies that THIS signal is THAT signal   
   but has gone though    
   something that has delayed it by ½ its period.   
   >   
   > Now, these two waveforms, say applied to a CRO (and ALWAYS own a CRO as long   
   as you shall live) and syncing, they look the same as long as they are   
   symmetrical. But we have two types of symmetrical.   
   >   
   > Consider:   
   >   
   > ¯|_|¯|_|¯|_|¯|_|¯|_|¯|_|   
   >   
   > /\/\/\/\/\/\/\/\/\/\/\/\   
   >   
   > And:   
   >   
   > /|/|/|/|/|/|/|/|/|/|/|/|/|   
   >   
   > Or as my Wavtek will put out:   
   >   
   > /|_/|_/|_/|_/|_/|_/|_/|_/|   
   >   
   > With a dead time that is half the sawtooth wave.   
   >   
   > Now, we should all know this, it is not that hard of a concept. But how is   
   it expressed ?   
   >   
   > If I was the word chooser of the world, a sawtooth wave would be called   
   "Symmetrical in period" but NOT "Symmetrical in polarity".   
   >   
   > What are the proper terms for that ?   
      
   Inversion symmetry and translation symmetry?   
      
   Jeroen Belleman   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)