Ideas from 'Introduction to 'Language Truth and Logic'' by A.J. Ayer [1946], by Theme Structure
[found in 'Language, Truth and Logic' by Ayer,A.J. [Penguin 1974,0-14-021200-0]].
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13. Knowledge Criteria / B. Internal Justification / 4. Foundationalism / c. Empirical foundations
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Basic propositions refer to a single experience, are incorrigible, and conclusively verifiable
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15. Nature of Minds / A. Nature of Mind / 4. Other Minds / c. Knowing other minds
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The argument from analogy fails, so the best account of other minds is behaviouristic
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19. Language / A. Nature of Meaning / 5. Meaning as Verification
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A statement is meaningful if observation statements can be deduced from it
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Directly verifiable statements must entail at least one new observation statement
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The principle of verification is not an empirical hypothesis, but a definition
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19. Language / D. Propositions / 1. Propositions
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Sentences only express propositions if they are meaningful; otherwise they are 'statements'
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22. Metaethics / A. Ethics Foundations / 2. Source of Ethics / i. Prescriptivism
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Moral approval and disapproval concerns classes of actions, rather than particular actions
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