[FOM] Proving FLT in PA
Timothy Y. Chow
tchow at alum.mit.edu
Tue Feb 21 19:00:09 EST 2006
Harvey Friedman wrote:
> I was wondering if you could give some sort of indication of some of the
> difficulties involved, and work needed, to show that FLT is provable in
> PA or even in EFA?
Here's one issue I've seen raised. The fundamental facts of etale
cohomology are developed in SGA, specifically SGA4, and Grothendieck
universes are (apparently---I've never studied SGA4) freely assumed
whenever necessary.
The experts seem to feel that for a "concrete application" like FLT, it
would be routine to eliminate any use of Grothendieck universes. In
particular, there's probably no interesting math involved in the
elimination process. However, unless someone actually goes to the trouble
of doing the necessary bookkeeping, there remains a question mark.
Unfortunately, because of the highly technical nature of the subject,
doing the bookkeeping would seem to require an inordinate amount of
effort.
References:
http://groups.google.com/group/sci.math/msg/af38a0ad1d7e878b
http://groups.google.com/group/sci.math/msg/c7a5c4fd185e06ef
Tim Chow
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