FOM: Re: finite axiomatization and conservative extension
neilt at mercutio.cohums.ohio-state.edu
Mon Apr 30 21:00:17 EDT 2001
Correction (courtesy of Thomas Forster):
> Could any fom-er supply a reference for the earliest proof of a
> theorem along the following lines?:
> Any r.e. first-order theory in a language L is, for some L*
> extending L, the restriction to L of some finitely axiomatizable
> theory in L*.
> Second question:
> Are there any interesting/natural conditions on such r.e. sets that
> would force L* to be a language of higher order than L, rather than
> merely a first-order extension of L?
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