Combining Texts
Ideas for
'Counterparts and Identity', 'Letter to Shumacher' and 'Set Theory and related topics (2nd ed)'
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2 ideas
4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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To say there could have been people who don't exist, but deny those possible things, rejects Barcan [Stalnaker, by Rumfitt]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / e. Equivalence classes
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Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz]
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