[FOM] The Derivability Conditions
panu.raatikainen at helsinki.fi
Mon Oct 1 05:37:50 EDT 2012
"Richard Heck" <richard_heck at brown.edu>:
> In any event, it occurred to me the other day that there is a direct
> argument > for G2 from Löb's three conditions that does /not/ go via
> Löb's Theorem, and > in no way involves the sort reasoning that is
> involved in the proof of that theorem.
Such a proof is given at least in Smullyan's book, and sketched in
Detlefsen's entry in the Routledge Encylopedia of Philosophy, as well
as in various surveys by Smorynski.
So a bit more than just folklore...
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