[FOM] Criteria for New Axioms
martdowd at aol.com
martdowd at aol.com
Wed May 6 17:03:53 EDT 2015
In reply to Dmytro Taranovsky
>I am not aware of significant consequences of inaccessible cardinals
>(when added to ZFC)
The existence of Mahlo cardinals, which I consider has been strongly
justified by ``iteration of collecting the universe'', settles independent
questions of Harvey Friedman's Boolean relation theory.
>Pick an ordinal kappa_1 with sufficiently strong reflection properties in L
I'm not sure what this means.
>There are intuitive arguments for strong large cardinal axioms, but they
>get progressively weaker as the axioms are strengthened.
There are reasons to suspect that the Mitchell order is bounded below
$\kappa^{++}$. Namely, it might be pathological that there are chains of
ultrafilters longer than any chain of stationary sets (GCH). This being so,
supercompact cardinals don't exist. I don't know about Woodin cardinals.
>Arguments based on "collecting the universe", which are most clear
>using reflective cardinals, lead to indescribable cardinals.
You seem to mean something different by "collecting the universe" than I do.
By my notion, it's a topic of current research whether weakly compact
cardinals exist.
>See my "Reflective Cardinals" paper
I'll look at this ASAP.
Regards,
Martin Dowd
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