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This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.
Boundary may refer to:
- Boundary (Geometry): The line that goes around a geometric figure.
- Boundary (Topology): The points in the closure of a set which are not in the interior of that set.
- Boundary (Graph Theory): The set of all the points that are adjacent to a given point.