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(latex.info)Math Miscellany

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Math Miscellany
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`\cdots'
     Produces a horizontal ellipsis where the dots are raised to the
     centre of the line.

`\ddots'
     Produces a diagonal ellipsis.

`\frac{num}{den}'
     Produces the fraction `num' divided by `den'.

`\ldots'
     Produces an ellipsis.  This command works in any mode, not just
     math mode.

`\overbrace{text}'
     Generates a brace over text.

`\overline{text}'
     Causes the argument text to be overlined.

`\sqrt[root]{arg}'
     Produces the square root of its argument.  The optional argument,
     `root', determines what root to produce, i.e., the cube root of
     `x+y' would be typed as `$\sqrt[3]{x+y}$'.

`\underbrace{text}'
     Generates text with a brace underneath.

`\underline{text}'
     Causes the argument text to be underlined.  This command can also
     be used in paragraph and LR modes.

`\vdots'
     Produces a vertical ellipsis.