American philosopher who defended modal realism — the view that possible worlds are concrete, spatiotemporally isolated universes — and made foundational contributions to semantics, mind, and metaphysics.
Developed modal realism: all possible worlds are equally real concrete universes, making counterfactuals and modal claims objectively true or false. Pioneered the analysis of causation via counterfactuals, developed functionalism in philosophy of mind, and created the logic of conditional sentences.
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