|Identity conditions: A) Theories differ in the domain of assumed objects and the use of terms. Therefore, it is not self-evident that the identity of an object can be determined when different theories refer to this object. One problem is, for example, the coarser or finer classification of properties in the different theories.|
B) If objects are characterized intensionally – e.g. "the oldest present person" - the reference changes with the context. In this case, the context must be used to determine the identity.
Books on Amazon
Identity condition / Prior: as an auxiliary definition to avoid entities
Objects of thought Oxford 1971
Arthur N. Prior
Papers on Time and Tense 2nd Edition Oxford 2003