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Indeterminacy/Feyerabend: a vocabulary of the future could be developed, in which not all concept are yet clarified. We would have to learn to argue with unclarified concepts and to use sentences for which there are no clear rules of use.
E.g. Arithmetic developed without a clear understanding of the concept of number. This came later.
Indeterminacy/Feyerabend: (Neumann's proof).
1) Interpretation of quantum theory: indeterminacy of our knowledge, not of nature itself.
2) Interpretation: (Bohr): indeterminacy is a property of nature. There are no states that are more accurate than the indeterminacy relation.
Wider den Methodenzwang Frankfurt 1997
Erkenntnis für freie Menschen Frankfurt 1979