### 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.