Combining Texts

All the ideas for 'Ethics: Inventing Right and Wrong', 'Gentzen's Analysis of First-Order Proofs' and 'Belief Truth and Knowledge'

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6 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

13831

Logic is based on transitions between sentences [Prawitz]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

13825

Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz]

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

13823

In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz]

12. Knowledge Sources / B. Perception / 7. Causal Perception

3900	Maybe experience is not essential to perception, but only to the causing of beliefs [Armstrong, by Scruton]

13. Knowledge Criteria / C. External Justification / 1. External Justification

4253	Externalism says knowledge involves a natural relation between the belief state and what makes it true [Armstrong]

22. Metaethics / A. Ethics Foundations / 1. Nature of Ethics / f. Ethical non-cognitivism

4761	The 'error theory' of morals says there is no moral knowledge, because there are no moral facts [Mackie, by Engel]