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An overline on a set, adding its limit points.
Also known as: Set closure, Closure of a set, Bar over a set, Overline notation
A bar over a set is its closure: the set together with everything it approaches. It shares its glyph with complex conjugation and with set complement, which means an overline in mixed text is genuinely ambiguous and has to be resolved from the surrounding subject.
Denotes the closure of a set: the set together with all its limit points.
Contexts: Mathematics
Is the smallest closed set containing the original, and equals the original exactly when it is already closed.
Contexts: Mathematics
Collides with the overline used for complex conjugation and, in some texts, for set complement.
Contexts: Mathematics
A horizontal stroke drawn across the full width above a set name.