Introduzione
Abstract
En
The ultrapower
of(Error rendering LaTeX formula) with respect to the ultrafilter F is considered: 
(the set of real numbers)(Error rendering LaTeX formula) ect. ect. In the hypothesis that the ultafilter is δ-incomplete, 
is properly imbedded in 
(and all admissible sentences of , which hold in also hold in ).
The ultrapower
of(Error rendering LaTeX formula) with respect to the ultrafilter F is considered: (the set of real numbers)(Error rendering LaTeX formula) ect. ect. In the hypothesis that the ultafilter is δ-incomplete, is properly imbedded in (and all admissible sentences of , which hold in also hold in ).DOI Code:
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