Moral Epistemology: The Mathematics Analogy

In this paper I discuss apparent similarities and differences between moral knowledge and mathematical knowledge, realistically conceived. I argue that many of these are only apparent, while others are less philosophically significant than might be thought. The picture that emerges is surprising. There are definitely differences between epistemological arguments in the two areas, contrary to what Putnam suggests. However, these differences, if anything, seem to increase the plausibility of moral realism as compared to mathematical realism, contrary to what Rachels suggests. It is hard to see how one might argue, on epistemological grounds, for moral antirealism while maintaining commitment to mathematical realism. But it may be possible to do the opposite.