It is quite impossible for a proposition to state that it itself is true. — Ludwig Wittgenstein
It is quite impossible for a proposition to state that it itself is true.
Ein Satz kann unmöglich von sich selbst aussagen, dass er wahr ist.
Source: Wikiquote · CC BY-SA 4.0
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A tautology's truth is certain, a 's possible, a contradiction's impossible. (Certain, possible, impossible: here we have the first indication of the scale that we need in the theory of probability.)
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