Tuesday, October 09, 2007

4.46 Of all the possible groups of truth-conditions there are two extreme cases.

In one case the proposition is true for all truth-possibilities of the elementary propositions. We say that the truth-conditions are tautological.

In the second case the proposition is false for all truth-possibilities: the truth-conditions are contradictory.

In the first case we call the proposition a tautology, in the second case a contradiction.


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