This means, however, that even though the semantics is uniform throughout the sciences, mathematics and ordinary language, deflationary nominalism requires the introduction of the existence predicate. But, at least on the surface, this predicate does not seem to have a counterpart in the way language is used in these domains. It is the same semantics throughout, but the formalization of the discourse requires an extended language to accommodate the existence predicate. As a result, the uniformity of the semantics comes with the cost of the introduction of a special predicate into the language to mark ontological commitment for formalization.