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'What is Logic?st1=Ian Hacking', 'works' and 'Modal Logic within Counterfactual Logic'
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10. Modality / B. Possibility / 8. Conditionals / a. Conditionals
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Strict conditionals imply counterfactual conditionals: □(A⊃B)⊃(A□→B) [Williamson]
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10. Modality / B. Possibility / 9. Counterfactuals
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Counterfactual conditionals transmit possibility: (A□→B)⊃(◊A⊃◊B) [Williamson]
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