Last Updated
：2025/11/28
principal ultrafilter
Noun
Japanese Meaning
（数学）超フィルターの一種で、超フィルターに属する任意の集合が、ある固定された一元集合を含む（そのスーパーセットである）という性質を持つもの。
（ plural ）
Quizzes for review
(mathematics) An ultrafilter such that every set belonging to it is the superset of some fixed singleton set.
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principal ultrafilter
In our construction, the principal ultrafilter concentrated on the singleton {x} contains every subset that includes x.
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In our construction, the principal ultrafilter concentrated on the singleton {x} contains every subset that includes x.
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