The Mathematics Morality Analogy

Philosophers from the early modern period and from today have claimed that there are important similarities between mathematics and morality, and that these similarities show that the ground of morality is as rational as the ground of mathematics. Such philosophers have argued that mathematics and morality share the same method of justification, that they are both a priori, and that they play the same role in explanation. I argue, in contrast, that the differences between mathematics and morality are more significant that the similarities, and that a comparison of the two gives us reason to think that morality does not have the rational basis that mathematics does.