 Poset Topology

Poset topology

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In mathematics, the poset topology associated with a partially ordered set S (or poset for short) is the Alexandrov topology (open sets are upper sets) on the poset of finite chains of S, ordered by inclusion.

Let V be a set of vertices. An abstract simplicial complex Δ is a set of finite sets of vertices, known as faces [itex]sigma subseteq V[/itex], such that
:[itex]forall rho, sigma. ; rho subseteq sigma in Delta Rightarrow rho in Delta[/itex]
Given a simplicial complex Δ as above, we define a (point set) topology on Δ by letting a subset [itex]Gamma subseteq Delta[/itex] be closed if and only if Γ is a simplicial complex:
:[itex]forall rho, sigma. ; rho subseteq sigma in Gamma Rightarrow rho in Gamma[/itex]
This is the Alexandrov topology on the poset of faces of Δ.

The order complex associated with a poset, S, has the underlying set of S as vertices, and the finite chains (i.e. finite totally-ordered subsets) of S as faces. The poset topology associated with a poset S is the Alexandrov topology on the order complex associated with S.

• Michelle L. Wachs, lecture notes IAS/Park City Graduate Summer School in Geometric Combinatorics (July 2004)

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