Meanings
nounprincipal ultrafilter (plural principal ultrafilters)
plural principal ultrafilters
- mathematicsAn ultrafilter such that every set belonging to it is the superset of some fixed singleton set.
Synonyms & antonyms
Opposite
Cite this entry
APA
principal ultrafilter. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/principal%20ultrafilter
MLA
“principal ultrafilter.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/principal%20ultrafilter. Accessed November 5, 2026.
Chicago
WatkinsX Dictionary, s.v. “principal ultrafilter,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/principal%20ultrafilter.
Source: principal ultrafilter on Wiktionary, CC BY-SA 4.0.