No Doppelgangers
"There are no Doppelgangers" is a fundamental theorem, edict or clause of cybernetics due to Gordon Pask in support of his theories of learning and interaction in all media: Conversation Theory and Interactions of Actors Theory. It accounts for physical differentiation and is Pask's exclusion principle. It states no two products of concurrent interaction can be the same because of their different dynamic contexts and perspectives. No Doppelgangers is necessary to account for the production by interaction and intermodulation (c.f. beats) of different, evolving, persisting and coherent forms. Two proofs are presented both due to Pask.
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