Combining Texts
Ideas for
'What is Logic?st1=Ian Hacking', 'Explanation and Reference' and 'Vagueness, Truth and Logic'
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10 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
13840
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First-order logic is the strongest complete compact theory with Löwenheim-Skolem [Hacking]
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13844
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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
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 / D. Assumptions for Logic / 2. Excluded Middle
9775
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Excluded Middle, and classical logic, may fail for vague predicates [Fine,K]
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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
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 / F. Referring in Logic / 1. Naming / a. Names
17505
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Using proper names properly doesn't involve necessary and sufficient conditions [Putnam]
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5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth
9771
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Logic holding between indefinite sentences is the core of all language [Fine,K]
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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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