 A second objection to fictionalism is based on the idea that fictionalists cannot account for the objectivity of mathematics. It is an obvious fact about mathematical practice that there’s some sort of objectivity at work in that practice. There’s an important difference in mathematics between sentences like ‘2 + 2 = 4’ and ‘3 is prime’ on the one hand and ‘2 + 2 = 5’ and ‘3 is composite’ on the other. There’s obviously some sense in which the first two sentences, but not the second two, are “correct”, or “right”, or “good”, or some such thing. The most obvious thing to say here is that the first two sentence are true whereas the latter two are false. But fictionalists cannot say this; they’re committed to saying that all four of these sentences are untrue. Thus, the question arises whether fictionalists have any adequate account of the objectivity of mathematics—i.e., of the differences between these two kinds of sentences.