Math 2.0

Order, lattices, ordered algebraic structures Complete lattices and completions Concept

Complete lattice

Summary

A complete lattice is a partially ordered set in which every subset, finite or infinite, has a supremum and an infimum. It is the setting of many fixed-point theorems, such as the Knaster–Tarski theorem. Power sets, lattices of subgroups and lattices of closed sets of a topological space are complete lattices. Every partially ordered set embeds in a complete lattice, its Dedekind–MacNeille completion.

Where this leads

21 pages build on this one.

Further reading

  1. Web https://en.wikipedia.org/wiki/Complete_lattice
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