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'Intensional Logic', 'Topics' and 'Grundlagen der Arithmetik (Foundations)'
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2 ideas
10. Modality / A. Necessity / 6. Logical Necessity
12259
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Reasoning is when some results follow necessarily from certain claims [Aristotle]
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10. Modality / E. Possible worlds / 3. Transworld Objects / a. Transworld identity
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Definite descriptions pick out different objects in different possible worlds [Fitting]
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