Combining Texts
Ideas for
'Counterpart theory and Quant. Modal Logic', 'The Reasons of Love' and 'On Interpretation'
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8 ideas
4. Formal Logic / A. Syllogistic Logic / 1. Aristotelian Logic
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22272
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Aristotle's later logic had to treat 'Socrates' as 'everything that is Socrates' [Potter on Aristotle]
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9405
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Square of Opposition: not both true, or not both false; one-way implication; opposite truth-values [Aristotle]
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4. Formal Logic / D. Modal Logic ML / 1. Modal Logic
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9728
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Modal Square 1: □P and ¬◊¬P are 'contraries' of □¬P and ¬◊P [Aristotle, by Fitting/Mendelsohn]
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9729
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Modal Square 2: ¬□¬P and ◊P are 'subcontraries' of ¬□P and ◊¬P [Aristotle, by Fitting/Mendelsohn]
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9730
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Modal Square 3: □P and ¬◊¬P are 'contradictories' of ¬□P and ◊¬P [Aristotle, by Fitting/Mendelsohn]
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9731
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Modal Square 4: □¬P and ¬◊P are 'contradictories' of ¬□¬P and ◊P [Aristotle, by Fitting/Mendelsohn]
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9732
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Modal Square 5: □P and ¬◊¬P are 'subalternatives' of ¬□¬P and ◊P [Aristotle, by Fitting/Mendelsohn]
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9733
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Modal Square 6: □¬P and ¬◊P are 'subalternatives' of ¬□P and ◊¬P [Aristotle, by Fitting/Mendelsohn]
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