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Ideas for 'Commentary on 'De Anima'', 'Nature's Metaphysics' and 'Causality: Reductionism versus Realism'

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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

9449	The plausible Barcan formula implies modality in the actual world [Bird]
	Full Idea: Modality in the actual world is the import of the Barcan formula, and there are good reasons for accepting the Barcan formula.
	From: Alexander Bird (Nature's Metaphysics [2007], 1.2)
	A reaction: If you thought logic was irrelevant to metaphysics, this should make you think twice.