4.46
Among the possible groups of truth-conditions there are two extreme cases. In the one case the proposition is true for all the truth-possibilities of the elementary propositions. We say that the truth-conditions are tautological. In the second case the proposition is false for all the truth-possibilities. The truth-conditions are self-contradictory. In the first case we call the proposition a tautology, in the second case a contradiction.
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- 4.461 The proposition shows what it says, the tautology and the contradiction that they say nothing. The…
- 4.462 Tautology and contradiction are not pictures of the reality. They present no possible state of…
- 4.463 The truth-conditions determine the range, which is left to the facts by the proposition. (The…
- 4.464 The truth of tautology is certain, of propositions possible, of contradiction impossible. (Certain,…
- 4.465 The logical product of a tautology and a proposition says the same as the proposition. Therefore…
- 4.466 To a definite logical combination of signs corresponds a definite logical combination of their…