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date: 18 April 2024


The Oxford Companion to Philosophy
Colwyn WilliamsonColwyn Williamson

The precise formulation varies, but a proposition, or propositional content, is customarily defined in modern logic as ‘what is asserted’ when a sentence (an indicative, or declarative, sentence) is used to say something true or false, or as ‘what is expressed by’ such a sentence. The term is also applied to what is expressed by the subordinate clauses of complex sentences, to forms of words which, if separated from the complex sentences of which they are part, can stand alone as indicative sentences in their own right. Accordingly, such sentences and clauses are often called ‘propositional signs’.... ...

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