 I am not sure how any real ontological analysis can
&gt;&gt;proceed without some consideration of principles of identity.
&gt;
&gt;Whitehead and I have perfectly fine definitions of identity
&gt;that agree with usage in both science and ordinary language.

&gt;CP&gt; Whitehead's view is characterized as mereological essentialism by Peter

&gt;Simons - where, if two things have the same events as parts, they are the
&gt;same thing. Right?

Where does he say that?  I just checked the index to his Parts
book,