4.43

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Agreement with the truth-possibilities can be expressed by co-ordinating with them in the scheme the mark "T" (true).

Absence of this mark means disagreement.

4.431    The expression of the agreement and disagreement with the truth-possibilities of the elementary propositions expresses the truth-conditions of the proposition.

The proposition is the expression of its truth-conditions.

(Frege has therefore quite rightly put them at the beginning, as explaining the signs of his logical symbolism. Only Frege's explanation of the truth-concept is false: if "the true" and "the false" were real objects and the arguments in ~p, etc., then the sense of ~p would by no means be determined by Frege's determination.)