* Their function `g`, which assigns objects from the domain to pegs, corresponds to our store function, which assigns entities to indexes.
+* At several places they talk about some things being *real extensions* of other things. This confused me at first, because they don't ever define a notion of "real extension." (They do define what they mean by "an extension.") At one point in the paper, it emerges that what they mean is what I'd call a *proper extension*: an extension which isn't identical to the original.
+
* [More hints](/hints/assignment_7_hint_2).