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Ideas from 'The Logic of Boundaryless Concepts' by Ian Rumfitt [2007], by Theme Structure
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5. Theory of Logic / A. Overview of Logic / 3. Value of Logic
9390
Logic guides thinking, but it isn't a substitute for it
9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects
9389
Vague membership of sets is possible if the set is defined by its concept, not its members