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'fragments/reports', 'fragments/reports' and 'The Evolution of Logic'
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10 ideas
5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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1312
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If everything is and isn't then everything is true, and a midway between true and false makes everything false [Aristotle on Heraclitus]
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5. Theory of Logic / G. Quantification / 3. Objectual Quantification
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13506
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The universal quantifier can't really mean 'all', because there is no universal set [Hart,WD]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
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13512
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Modern model theory begins with the proof of Los's Conjecture in 1962 [Hart,WD]
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13505
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Model theory studies how set theory can model sets of sentences [Hart,WD]
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13511
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Model theory is mostly confined to first-order theories [Hart,WD]
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13513
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Models are ways the world might be from a first-order point of view [Hart,WD]
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5. Theory of Logic / K. Features of Logics / 6. Compactness
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13496
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First-order logic is 'compact': consequences of a set are consequences of a finite subset [Hart,WD]
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5. Theory of Logic / L. Paradox / 4. Paradoxes in Logic / c. Berry's paradox
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13484
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Berry's Paradox: we succeed in referring to a number, with a term which says we can't do that [Hart,WD]
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5. Theory of Logic / L. Paradox / 5. Paradoxes in Set Theory / c. Burali-Forti's paradox
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13482
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The Burali-Forti paradox is a crisis for Cantor's ordinals [Hart,WD]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / a. The Liar paradox
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13507
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The machinery used to solve the Liar can be rejigged to produce a new Liar [Hart,WD]
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