However the mathematical case does not fully parallel the moral one.  One of the options in the moral case was naturalist realism, which reads moral claims as about natural facts which play causal roles in the spatiotemporal world. However, given the explicit commitment of mathematical claims to abstract objects without spatiotemporal location, this option does not seem available in the mathematical case (but see Maddy 1990). So we seem required to choose between non-naturalist realism about non-spatiotemporal mathematical entities or naturalist irrealism.