 Frege treats distinctions in categories as correlates of distinctions in types of linguistic expression. The category of object, for example, is distinguished by reference to the linguistic category of proper name (Dummett 1973 [1981], 55–56; cf. Wright 1983, 13 and Hale 1987, 3–4) – i.e., an object just is the correlate of a proper name, where proper names are held to include all singular terms (including singular substantival phrases preceded by the definite article). Broadly Fregean approaches have been more recently developed and defended by Michael Dummett (1973 [1981]) and Bob Hale (2010).