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Hei·sen·berg un·cer·tain·ty Prin·ci·pleالنطق
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() named for Werner Heisenberg, its discoverer, translated into English from a variety of original German terms. Heisenberg originally called the concept Ungenauigkeit (inexactness) or Unbestimmtheit (underminedness), whereas his mentor and collaborator Niels Bohr often used Unsicherheit (unsureness). Today in German the most commonly used term for the principle is Unschärfe (blurredness or fuzziness). Postscript to Michael Frayn's Copenhagen (New York : Anchor Books, 2000).