Combining Philosophers
Ideas for Aeschylus, Roy Sorensen and Michael Potter
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9 ideas
5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
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We can formalize second-order formation rules, but not inference rules [Potter]
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5. Theory of Logic / B. Logical Consequence / 3. Deductive Consequence |-
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Frege's sign |--- meant judgements, but the modern |- turnstile means inference, with intecedents [Potter]
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5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism
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Deductivism can't explain how the world supports unconditional conclusions [Potter]
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5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence
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No attempt to deny bivalence has ever been accepted [Sorensen]
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
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We now see that generalizations use variables rather than abstract entities [Sorensen]
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5. Theory of Logic / H. Proof Systems / 3. Proof from Assumptions
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Supposing axioms (rather than accepting them) give truths, but they are conditional [Potter]
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5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth
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Modern logical truths are true under all interpretations of the non-logical words [Potter]
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5. Theory of Logic / L. Paradox / 3. Antinomies
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Denying problems, or being romantically defeated by them, won't make them go away [Sorensen]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / a. The Liar paradox
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Banning self-reference would outlaw 'This very sentence is in English' [Sorensen]
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