Combining Texts
Ideas for
'The Runabout Inference Ticket', 'What is Philosophy?' and 'What is Logic?'
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13 ideas
5. Theory of Logic / A. Overview of Logic / 3. Value of Logic
8246
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Logic hates philosophy, and wishes to supplant it [Deleuze/Guattari]
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8219
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Logic has an infantile idea of philosophy [Deleuze/Guattari]
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5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
13845
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The various logics are abstractions made from terms like 'if...then' in English [Hacking]
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5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic
13844
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A limitation of first-order logic is that it cannot handle branching quantifiers [Hacking]
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13840
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First-order logic is the strongest complete compact theory with Löwenheim-Skolem [Hacking]
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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
13842
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Second-order completeness seems to need intensional entities and possible worlds [Hacking]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
17896
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We need to know the meaning of 'and', prior to its role in reasoning [Prior,AN, by Belnap]
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17898
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Prior's 'tonk' is inconsistent, since it allows the non-conservative inference A |- B [Belnap on Prior,AN]
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11021
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Prior rejected accounts of logical connectives by inference pattern, with 'tonk' his absurd example [Prior,AN, by Read]
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13836
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Maybe introducing or defining logical connectives by rules of inference leads to absurdity [Prior,AN, by Hacking]
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13837
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With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking]
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
13839
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Perhaps variables could be dispensed with, by arrows joining places in the scope of quantifiers [Hacking]
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5. Theory of Logic / J. Model Theory in Logic / 3. Löwenheim-Skolem Theorems
13843
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If it is a logic, the Löwenheim-Skolem theorem holds for it [Hacking]
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