Vinculum (symbol)

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A vinculum is a horizontal line put over a mathematical expression. It shows that it belongs together as a group. (Vinculum is Latin for "chain".)

Examples are:

1. groups of digits repeating forever, for example,

\frac{1}{3} = 0.333333\dots = 0.\overline{3}

2. fractions

\frac{500}{10 \times 10} = \frac{5}{1} = 5

3. radicals (in the following example the quantity ab+2 is the radicand, and thus has a vinculum over it):

\sqrt[n]{ab+2}

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