Sortal predicates have been associated
to a counting process, wich acts as a criterion of identity for the individuals
they correctly apply to. We discuss in what sense certain types of predicates
suggested by quantum physics deserve the title of ‘sortal’ as well, although
they do not characterize neither a process of counting nor a criterion of
identity for the entities that falls under them. We call such predicates
‘quantum-sortal’ predicates, and instead of a process of counting, we associate
to them a ‘criterion of cardinality’. Then it is discussed how they can be
formally characterized.
