FOM: Quantifier question
friedman@mbi.math.ohio-state.edu
friedman at mbi.math.ohio-state.edu
Fri Jul 12 13:16:49 EDT 2002
Reply to Franzen 7/12/02.
It appears that the completeness of the axiomatization that you give for "there
are infinitely many x such that" without function symbols would imply that this
obeys the compactness theorem. However, even with = as the only semantic
symbol, it is not compact. E.g., every finite subset of
therexists at least 2 things
therexists at least 3 things
therexists at least 4 things
..
not(therexists infinitely many things)
is satisfiable, but the whole subset is not.
Have I misunderstood what you were saying?
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