With these motivations I entered counterfactual analysis in 1994 (with my student Alex Balke). Not surprisingly, the algorithmization of counterfactuals made a bigger splash in artificial intelligence and cognitive science than in philosophy. Philosophers tended to view structural models as merely one of many possible implementations of Lewis’s possible-worlds logic. I dare to suggest that they are much more than that. Logic void of representation is metaphysics. Causal diagrams, with their simple rules of following and erasing arrows, must be close to the way that our brains represent
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