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Notes Dictated to G.E. Moore in Norway: Difference between revisions
Notes Dictated to G.E. Moore in Norway (view source)
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It follows from the fact that a-b is transitive, that where we have a-b-a the first a has to the second the same relation that it has to b. It is just as from the fact that a-true implies b-false, and b-false implies c-true, we get that a-true implies c-true. And we shall be able to see, having fixed the description of a tautology, that p ≡ ~(~p) is a tautology. | It follows from the fact that a-b is transitive, that where we have a-b-a the first a has to the second the same relation that it has to b. It is just as from the fact that a-true implies b-false, and b-false implies c-true, we get that a-true implies c-true. And we shall be able to see, having fixed the description of a tautology, that p ≡ ~(~p) is a tautology. | ||
That, when a certain rule is given, a symbol is tautological ''shews'' a logical truth.<references /> | That, when a certain rule is given, a symbol is tautological ''shews'' a logical truth. | ||
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