 Moreover, intensionality is marked by tests other than the intersubstitution of co-referential terms, co-extensive predicates, or logically equivalent sentences. A context may be deemed intensional if it contains a phrase with a quantifier that allows for an “unspecific” reading (see the entry on  intensional transitive verbs).  For example, it may be true that Oedipus is seeking a member of his family, but not true that he is seeking Jocasta, in spite of the fact that Jocasta is a member of his family. For, there might be no family member in particular whom Oedipus is seeking. Something like this seems to be the point the Mohists are making with the following example: