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When we defined the interpretation of propositions, we insisted that a proposition has a truth value that is either true or false. We also noted that propositions build only a part of all the strings which are syntactically correct among other strings which can be formulated in a given formal language $L$. But how about all the other strings, for which we cannot assign a truth value? Important types of such statements are paradoxes.

Let a formal language $L$ be given, in which the valuation function $[[]]_I$ of $PL0$ (law of excluded middle) holds. A paradox is a string $s\in L$, for which the interpretation $[[s]]_I=undefined,$ i.e. for which it is not possible to assign a truth value, and which apparently contradicts itself.

| | | | | created: 2018-01-07 00:09:46 | modified: 2020-05-04 18:57:20 | by: bookofproofs | references: [7838]