FOM: Logic of x >> 0 and x >> y
Kanovei
kanovei at wmwap1.math.uni-wuppertal.de
Fri Feb 15 10:33:58 EST 2002
>From: Harvey Friedman <friedman at math.ohio-state.edu>
>
2. Let phi be an arbitrary sentence in the language of PA(St). Can we
figure out whether phi is true? By this I mean, is there always a sentence
psi without S such that PA(St) proves (phi iff psi)? If this fails, is
there an interesting extension of PA(St) so that this holds?
>
I proved near 1991 that this fails for IST but holds for a
version of IST which considers only those sets which are
elements of standard sets.
V.Kanovei
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