The aim of this work is to provide a sufficiently reliable criterion for distinguishing abstract entities from concrete entities. The two mail candidates are the non spatio-temporal collocation and the abstraction principles à la Frege. We suggest that these criteria have to be considered as complementary and not opposite; this fact is explained by the metaphysical framework of the abstract entities taken into account, namely if they are dependent or independent entities. Since each criterion has an intended background metaphysical framework, the adoption of both will make more complex the description of the domain of abstracta.
De Florio, C., Sui criteri di astrattezza, <<RIVISTA DI FILOSOFIA NEOSCOLASTICA>>, 2015; 2015 (1-2): 169-185 [http://hdl.handle.net/10807/68265]