Full Idea
The best-known candidate for an identity condition for properties is necessary coextensiveness.
Gist of Idea
The best-known candidate for an identity condition for properties is necessary coextensiveness
Source
Chris Swoyer (Properties [2000], 6)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.41
A Reaction
The necessity (in all possible worlds) covers renates and cordates. It is hard to see how one could assert the necessity without some deeper explanation. What makes us deny that actually coextensive renates and cordates have different properties?