A Dynamic Semantics for Causal Counterfactuals
Under the standard approach to counterfactuals, to determine the meaning of a counterfactual sentence, we consider the {`}closest{''} possible world(s) where the antecedent is true, and evaluate the consequent. Building on the standard approach, some researchers have found that the set of worlds to be considered is dependent on context; it evolves with the discourse. Others have focused on how to define the {`}distance{''} between possible worlds, using ideas from causal modeling. This paper integrates the two ideas. We present a semantics for counterfactuals that uses a distance measure based on causal laws, that can also change over time. We show how our semantics can be implemented in the Haskell programming language.
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