Includes bibliographical references (pages [337]-347) and index
Synopsis -- The nature of modality -- Absolute necessity and iterated modality -- On the contingency of worlds -- A theory of worlds -- Essence, laws, and explanation -- Metaphysical and nomic necessity -- The standards of colseness -- Clarifications, additions, and objections -- Causation, nomic determination, and the counterfactual test -- On the genealogy of modality -- Extensions and limitations of the counterfactual test
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Argues that the concepts of necessity and possibility originate in a common type of thought experiment, counterfactual reasoning, that allows us to investigate explanatory connections and is colsely related to the controlled experiments of empirical science