Combining Texts
Ideas for
'fragments/reports', 'Nature's Metaphysics' and 'Introduction to the Theory of Logic'
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8 ideas
4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
8077
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Stoic propositional logic is like chemistry - how atoms make molecules, not the innards of atoms [Chrysippus, by Devlin]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL
20791
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Chrysippus has five obvious 'indemonstrables' of reasoning [Chrysippus, by Diog. Laertius]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
9449
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The plausible Barcan formula implies modality in the actual world [Bird]
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
10888
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Sets can be defined by 'enumeration', or by 'abstraction' (based on a property) [Zalabardo]
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4. Formal Logic / F. Set Theory ST / 2. Mechanics of Set Theory / b. Terminology of ST
10889
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The 'Cartesian Product' of two sets relates them by pairing every element with every element [Zalabardo]
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10890
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A 'partial ordering' is reflexive, antisymmetric and transitive [Zalabardo]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
10886
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Determinacy: an object is either in a set, or it isn't [Zalabardo]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / l. Axiom of Specification
10887
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Specification: Determinate totals of objects always make a set [Zalabardo]
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