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
Basic propositions refer to a single experience, are incorrigible, and conclusively verifiable
15. Nature of Minds / A. Nature of Mind / 4. Other Minds / c. Knowing other minds
The argument from analogy fails, so the best account of other minds is behaviouristic
19. Language / B. Meaning / 3. Meaning as Verification
A statement is meaningful if observation statements can be deduced from it
Directly verifiable statements must entail at least one new observation statement
The principle of verification is not an empirical hypothesis, but a definition
19. Language / E. Propositions / 1. Propositions
Sentences only express propositions if they are meaningful; otherwise they are 'statements'
22. Metaethics / C. Sources of Ethics / 5. Prescriptivism
Moral approval and disapproval concerns classes of actions, rather than particular actions