Abstract

It is a common presupposition in ontology (metaphysics) that a so-called 'principle of individuation' amounts to a principle of counting. Against this presupposition I argue that the predicates 'x is the same individual as y' and 'x is one with y' are neither co-extensional nor co-intensional. Non-countable entities such as masses or stuffs (or the referents of nouns in classifier languages) also fulfill the requirements of individuality. I suggest that Leibniz' 'principle of the identity of indiscernibles' (PII) should be taken as a principle of individuality, rather than as a principle of the individuality of countables.