[FOM] Naturality of Con(ZFC)
MartDowd at aol.com
MartDowd at aol.com
Tue Jan 15 13:07:13 EST 2013
This posting is in response to Vaughn Pratt's comment:
> Meanwhile I will continue to ponder the possibility you raise that
> consistency of ZFC is unnatural.
Although I haven't read Harvey's manuscripts, he says in #513
:It was shown in #75 that the Divine system corresponds to something a
little weaker than a measurable cardinal
Con(ZFC) is much weaker. Indeed it is implied by "there exists a strongly
inaccessible cardinal". There are now strong arguments that these exist,
due to the fact that they comprise the first step in a "natural", indeed
"inevitable", process of extending the cumulative hierarchy. I believe it is
an important question of modern set theory, whether weakly compact
cardinals are natural in this sense. Again, these are much weaker than measurable
cardinals.
- Martin Dowd
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