19 Jan
2009
19 Jan
'09
9:42 p.m.
G'day all. I wrote:
- Intuitionistic logic systems.
- The "truth values" of an arbitrary topos (i.e. the points of the subobject classifier).
Sorry, I misread the question. These are _not_ instances of Boolean (or at least the latter isn't an instance in general). Cheers, Andrew Bromage