On the Plurality of Worlds

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Modal realism is defended as the thesis that our world is one among many, with individuals here being just a fraction of a broader existence. The author, Lewis, presents his favored version of modal realism and addresses common objections, including the necessity of actual existence and concerns about morality and skepticism. While acknowledging the weight of skepticism, he argues that the theoretical benefits of modal realism outweigh these concerns. In his concluding chapter, Lewis advocates for his 'method of counterparts' for understanding trans-world identity over other theories.