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Full Idea
When you do what a logician would call 'asserting not-p', you are saying 'p is false'.
Gist of Idea
Asserting not-p is saying p is false
Source
Bertrand Russell (An Inquiry into Meaning and Truth [1940], 5)
Book Ref
Russell,Bertrand: 'An Inquiry into Meaning and Truth' [Penguin 1967], p.77
A Reaction
This is presumably classical logic. If we could label p as 'undetermined' (a third truth value), then 'not-p' might equally mean 'undetermined'.
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| 24075 | Convictions, more than lies, are the great enemy of truth [Nietzsche] |
| 4548 | Only because there is thought is there untruth [Nietzsche] |
| 18305 | To love truth, you must know how to lie [Nietzsche] |
| 16477 | Asserting not-p is saying p is false [Russell] |
| 5417 | A good theory of truth must make falsehood possible [Russell] |
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