Full Idea
Abstract entities (as nonspatiotemporal) seem to be the only candidates for specific and full identity specifications.
Gist of Idea
Only abstract things can have specific and full identity specifications
Source
C.B. Martin (The Mind in Nature [2008], 05.2 n1)
Book Reference
Martin,C.B.: 'The Mind in Nature' [OUP 2008], p.47
A Reaction
Martin says that only the 'mad logician' seeks such specifications elsewhere. Some people like persons to have perfect identity. God is a popular candidate too. Can objects have perfect 'macroscopic' identity?