 This approach to determinables and determinates is attractive, Denby argues, in that sets are ontologically unproblematic and their identity-conditions and relations well-understood (and similarly for functions and metric spaces), and in that the account accommodates “the pre-theoretic intuitions about the logical relations among properties” (2001: 310), including Unique  determination,[34] Determinate  similarity/comparability,[35]  and Determinate incompatibility. The primary concerns here are again those associated with anti-realist or reductive views of determinables, though as with Funkhouser’s account it might be that the broad structure of Darby’s metric conception of determinables is compatible with a non-reductivist reading.