Math 2.0

Order, lattices, ordered algebraic structures Lattices: basic notions Concept

Order filter

Summary

A filter of a partially ordered set is a nonempty subset that is closed upward. Moreover, any two of its elements have a common lower bound inside it. In a lattice this means: closed upward and closed under meets. Filters are the order duals of lattice ideals. A filter on a set XX is a proper order filter in the lattice of subsets of XX.

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Further reading

  1. Web https://en.wikipedia.org/wiki/Filter_(mathematics)
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Changed2 November 2026

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