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单词 FilterBasis
释义

filter basis


A filter subbasis for a set S is a collectionMathworldPlanetmath of subsets of S which has the finite intersection property.

A filter basis B for a set S is a non-empty collection of subsets of S which does not contain the empty setMathworldPlanetmath such that, for every uB and every vB, there exists a wB such that wuv.

Given a filter basis B for a set S, the set of all supersetsMathworldPlanetmath of elements of B forms a filter on the set S. This filter is known as the filter generated by the basis.

Given a filter subbasis B for a set S, the set of all supersets of finite intersectionsDlmfMathworldPlanetmath of elements of B is a filter. This filter is known as the filter generated by the subbasis.

Two filter bases are said to be equivalentMathworldPlanetmathPlanetmathPlanetmathPlanetmath if they generate the same filter. Likewise, two filter subbases are said to be equivalent if they generate the same filter.

Note: Not every author requires that filters do not contain the empty set.Because every filter is a filter basis then accordingly some authors allow that a filterbase can contain the empty set.

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更新时间:2025/5/5 1:21:30