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'', 'Introduction to 'Language Truth and Logic'' and 'The Anti-Christ'
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5 ideas
19. Language / A. Nature of Meaning / 5. Meaning as Verification
5164
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A statement is meaningful if observation statements can be deduced from it [Ayer]
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5165
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Directly verifiable statements must entail at least one new observation statement [Ayer]
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5166
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The principle of verification is not an empirical hypothesis, but a definition [Ayer]
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19. Language / D. Propositions / 1. Propositions
5162
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Sentences only express propositions if they are meaningful; otherwise they are 'statements' [Ayer]
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19. Language / F. Communication / 3. Denial
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We learn 'not' along with affirmation, by learning to either affirm or deny a sentence [Rumfitt]
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