  This picture has recently been complicated by Maddy's claims that what she calls Arealism—not taking set theory and more generally mathematics to be true—may be just as scientifically respectable as Thin Realism—roughly, the view that sets have only the properties ascribed to them by set theory (2007, IV.4). This entry does not have space to do justice to this twist in Maddy's metaphilosophy. Suffice it to note the following. The issues just discussed seem to arise for the Thin Realist just as much as any other kind of realist. And the Arealist construal seems to transform Maddy's position into something quite different from the heterogeneous naturalism under consideration here.