t;things is not itself physical.)
&gt; &gt;
&gt; &gt;Are you taking physical and abstract as two sides of the same distinction
&gt; &gt;here - or are there more types. It also seems to me that the complete
&gt; &gt;banning of spatio-temporal location for sets can be problematic if you
&gt;want
&gt; &gt;to think of things such as groups (football teams, and so on) as sets.
&gt;Some
&gt; &gt;people have suggested this - and ordinary language (for what it is worth)
&gt;at
&gt; &gt;least supports the view that 