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A vinculum is a horizontal line placed over a mathematical expression, used to indicate that it is to be
considered a group.
Examples of its use include the case of a group of infinitely repeating digits, for example,
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It is also used in the notation of a radical to
indicate the radicand whose root is being indicated. In the case of
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the quantity ab + 2 is the radicand, and thus has a vinculum over it.
The vinculum is also sometimes used in Boolean_algebra, where it
serves to indicate a group of expressions whose logical result is to be NOTed, as in
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