- nonprincipal ultraproduct
- мат.неглавное ультрапроизведение
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
Ultrafilter — In the mathematical field of set theory, an ultrafilter on a set X is a collection of subsets of X that is a filter, that cannot be enlarged (as a filter). An ultrafilter may be considered as a finitely additive measure. Then every subset of X is … Wikipedia