1. 
   Vanishing mediator
   A vanishing mediator is a concept that exists to mediate between two opposing ideas, as a transition occurs between them. At the point where one idea has been replaced by the other, and the concept is no longer required, the mediator vanishes. In terms of Hegelian dialectics, the conflict between t...
   Found op http://en.wikipedia.org/wiki/Vanishing_mediator
   
   

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