# Topological boundary

This English edition is an AI candidate and does not yet have an OCME Atlas (GPT-6) Twin closure receipt.

[Catalogue presentation and source-binding data](https://ocme.evemisslab.com/data/i18n/catalogue.en.json)



## [Topological boundary](https://ocme.evemisslab.com/en/atlas/atlas-topological-boundary/)

The boundary of A is closure(A) minus interior(A), equivalently closure(A) intersected with the closure of its complement.

atlas-topological-boundary · canonical_mko

[Topological boundary](https://ocme.evemisslab.com/en/mko/mko-topological-boundary/)

## Prerequisite nodes


- [Topological closure and interior](https://ocme.evemisslab.com/en/atlas/atlas-closure-and-interior/)
- [Set operations](https://ocme.evemisslab.com/en/atlas/atlas-set-operations/)