Counterpossibles are counterfactuals whose antecedents are impossible. On the orthodox view, all counterpossibles are vacuously true. This video examines the debate between vacuism and non-vacuism, drawing primarily on Alex Korucek's article "Counterpossibles" and Timothy Williamson's "Counterpossibles in Semantics and Metaphysics".
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0:00 - Counterpossibles
1:12 - Vacuism
7:25 - Explaining nonvacuist intuitions
15:09 - Removing nonvacuist intuitions
22:41 - Counterpossibles in philosophical debate
26:22 - Counterpossibles and causation
30:11 - Counterpossibles in science
36:16 - Impossible worlds
42:34 - No logic of counterfactuals?
47:13 - Anything is possible?