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Ideas for 'Phenomenalism', 'Modern Philosophy:introduction and survey' and 'Conjectures and Refutations'

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1. Philosophy / F. Analytic Philosophy / 3. Analysis of Preconditions

3891	If p entails q, then p is sufficient for q, and q is necessary for p [Scruton]
	Full Idea: If p entails q, then p is sufficient for q, and q is necessary for p.
	From: Roger Scruton (Modern Philosophy:introduction and survey [1994], 15.7)