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Ideas for 'works', 'Commentary on Euclid's 'Elements'' and 'A Plea for Substitutional Quantification'

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4. Formal Logic / D. Modal Logic ML / 4. Alethic Modal Logic

9470	Modal logic is not an extensional language [Parsons,C]
	Full Idea: Modal logic is not an extensional language.
	From: Charles Parsons (A Plea for Substitutional Quantification [1971], p.159 n8)
	A reaction: [I record this for investigation. Possible worlds seem to contain objects]