[FOM] Eradicating Evil?
Urs Schreiber
urs.schreiber at googlemail.com
Thu Oct 30 13:06:03 EDT 2014
On 10/29/14, Harvey Friedman <hmflogic at gmail.com> wrote in small part:
> [...] as long as your categories have sets of objects, you’ll be able
> to talk about equality of those objects. But I don’t see any way to
> solve that unless your foundational axioms are really about the
> 2-category of categories
No, to solve this one just needs to have foundational axioms that are
at least about the 2-groupoid of groupoids.
The resulting solution is spelled out in Ahrens-Kalulkin-Shulman:
http://ncatlab.org/nlab/show/category#AhrensKapulkinShulman13
http://arxiv.org/abs/1303.0584
More information about the FOM
mailing list