Combining Texts

All the ideas for 'Essays on Intellectual Powers: Conception', 'Semantics for Propositional Attitudes' and 'Investigations into Logical Deduction'

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7 ideas

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

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Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]

7. Existence / D. Theories of Reality / 11. Ontological Commitment / a. Ontological commitment

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Our commitments are to an 'ontology', but also to an 'ideology', or conceptual system [Hintikka]

9. Objects / D. Essence of Objects / 4. Essence as Definition

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Objects have an essential constitution, producing its qualities, which we are too ignorant to define [Reid]

10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / b. Conceivable but impossible

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Impossibilites are easily conceived in mathematics and geometry [Reid, by Molnar]

10. Modality / E. Possible worlds / 2. Nature of Possible Worlds / a. Nature of possible worlds

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Commitment to possible worlds is part of our ideology, not part of our ontology [Hintikka]

19. Language / B. Reference / 1. Reference theories

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Reference is by name, or a term-plus-circumstance, or ostensively, or by description [Reid]

19. Language / B. Reference / 3. Direct Reference / c. Social reference

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A word's meaning is the thing conceived, as fixed by linguistic experts [Reid]