It's very mathematical base. A whole lot of:
WR-INI: X at t1 is identical to Y at t2 iff there is some fact F1 about X at t1, and some fact F2 about Y at t2, and F1 and F2 are irreducible to facts about the subjects’ psychology or physiology, and X at t1 is identical with Y at t2 in virtue of the fact that the propositions stating F1 and F2 differ only insofar as that “X” and “t1” occur in the former where “Y” and “t2” occur in the latter.
If that shit makes sense to you then go for it. Personally I changed to PHIL1013: Society, Knowledge and Self.