# Math Miscellany

`\cdots`
  Produces a horizontal ellipsis where the dots are raised to the centre of the line. eg.
`\ddots`
  Produces a diagonal ellipsis. eg.
`\frac{num}{den}`
  Produces the fraction `num` divided by `den`. eg.
`\ldots`
  Produces an ellipsis. This command works in any mode, not just math mode. eg.
`\overbrace{text}`
  Generates a brace over text. eg.
`\overline{text}`
  Causes the argument text to be overlined. eg.
`\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 `$\sqrt[3]{x+y}$`. eg.
`\underbrace{text}`
  Generates text with a brace underneath. eg.
`\underline{text}`
  Causes the argument text to be underlined. This command can also be used in paragraph and LR modes. eg.
`\vdots`
  Produces a vertical ellipsis. eg.

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