 If arguments like the ones we've been discussing here are cogent, then sentences like ‘3 is prime’ are not about physical or mental objects, and therefore, psychologism and immanent realism are not tenable views of mathematics. But that is not the end of the singular term argument for the existence of abstract mathematical objects, for we still need to consider nominalistic views of sentences like ‘3 is prime’. In order for platonists to establish their view, they need to refute these nominalistic views as well as psychologistic and physicalistic views. And it should be noted that this is the hard part. There is a good deal of agreement among philosophers of mathematics that psychologism and immanent realism are untenable; that is, most philosophers of mathematics are either platonists or nominalists; but there is very little agreement as to whether platonism or nominalism is correct.