Want to take part in these discussions? Sign in if you have an account, or apply for one below
Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
Thanks for starting this. It would be really great to use this page to clarify a lot of misconceptions. For instance, it is sometimes said that unique choice holds in any lex category — I think there is a sense in which this is true, but it is not at all the pertinent sense.
this mathoverflow question might be useful
A quasitopos has (at least) two “internal languages”, one that satisfies unique choice and one that doesn’t.
I’m curious what you had in mind about lex categories, Jon. It does seem to me that the most obvious formulation of unique choice in an arbitrary lex category is the one using arbitrary subobjects, and that one holds.
1 to 8 of 8