Combining Texts
Ideas for
'What is Logic?st1=Ian Hacking', 'Modal Logic as Metaphysics' and 'Ontology and the Ambitions of Metaphysics'
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12 ideas
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
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First-order logic is the strongest complete compact theory with Löwenheim-Skolem [Hacking]
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A limitation of first-order logic is that it cannot handle branching quantifiers [Hacking]
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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
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Second-order completeness seems to need intensional entities and possible worlds [Hacking]
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Since properties can have properties, some theorists rank them in 'types' [Hofweber]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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
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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 / F. Referring in Logic / 1. Naming / c. Names as referential
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Maybe not even names are referential, but are just by used by speakers to refer [Hofweber]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / d. Singular terms
21636
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'Singular terms' are not found in modern linguistics, and are not the same as noun phrases [Hofweber]
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21637
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If two processes are said to be identical, that doesn't make their terms refer to entities [Hofweber]
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5. Theory of Logic / G. Quantification / 1. Quantification
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The inferential quantifier focuses on truth; the domain quantifier focuses on reality [Hofweber]
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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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