Philosophy Lexicon of Arguments

Atomic sentence (elementary proposition): represents or depicts a fact. Problem of how facts can be demarcated and seperated from each other.
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PopperVsWittgenstein/Tractatus: any "meaningful sentence" should be logically reducible to ’elementary propositions’. All meaningful sentences are "images of reality". His sense criterion thus coincides with the demarcation criterion of induction logic. This fails due to the problem of induction.
The positivist radicalism destroyed metaphysics and natural science: the laws of nature are not logically reducible to elementary empirical propositions.
After Wittgenstein’s criterion of meaning even the laws of nature are meaningless, i.e. not true (legitimate) sentences. This is not a distinction but an identification with metaphysics.

Po I
K. Popper
Objektive Erkenntnis Hamburg 1993

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Ed. Martin Schulz, access date 2017-05-29