This chapter lays out the core argument of the book, which runs as follows: (1) if moral facts do not exist, then epistemic facts do not exist; (2) epistemic facts exist; (3) so, moral facts exist; (4) if moral facts exist, then moral realism is true; (5) so, moral realism is true. Having done this, the introduction engages in two other tasks: first, it discusses the structure of the arguments for key premises of the core argument, such as premises (1) and (2) and second, it highlights a series of assumptions that are made in the book's discussion.
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