Definition:Exterior (Topology)/Notation
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Definition
Let $T$ be a topological space.
Let $H \subseteq T$.
The exterior of $H$ can be denoted:
- $\map {\mathrm {Ext} } H$
- $H^e$
The first is regarded by some as cumbersome, but has the advantage of being clear.
$H^e$ is neat and compact, but has the disadvantage of being relatively obscure.
On $\mathsf{Pr} \infty \mathsf{fWiki}$, the notation of choice is $H^e$.