Ian summarizes:
>In my book, if it exists then it's real.
<sigh> I haven't said otherwise. We're talking at cross purposes, I'm afraid. I never claimed that collections, sets, relations, concepts, etc. are not real, merely that they're not "entities". I've conceded that your definition of "entity" embraces such mental objects, while stating that my definition is different. Can we stop flogging a dead horse?
Dick