Werner Heisenberg First Writes About His Uncertainty Principle

Werner Heisenberg First Writes About His Uncertainty Principle

Werner Heisenberg
Source: Deutsches Bundesarchiv

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While living in Copenhagen Werner Heisenberg develops his famous Uncertainty Principle. On this date, he writes a letter to fellow physicist Wolfgang Pauli to describe it. This is the first time that a description of the Uncertainty Principle is written down and Heisenberg labels it "Ungenauigkeit" (imprecision).

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