Delimiters are parentheses, braces, or other characters used to mark the start and end of subformulas. This formula has three sets of parentheses delimiting the three subformulas.

(z-z_0)^2 = (x-x_0)^2 + (y-y_0)^2

The delimiters do not need to match, so you can enter \( [0,1) \).

Here are the common delimiters:

Delimiter Command Name
( ( Left parenthesis
) ) Right parenthesis
\} { or \lbrace Left brace
\{ } or \rbrace Right brace
[ [ or \lbrack Left bracket
] ] or \rbrack Right bracket
\lfloor Left floor bracket
\rfloor Right floor bracket
\lceil Left ceiling bracket
\rceil Right ceiling bracket
\langle Left angle bracket
\rangle Right angle bracket
/ / Slash, or forward slash
\ \backslash Reverse slash, or backslash
| | or \vert Vertical bar
\| or \Vert Double vertical bar

The mathtools package allows you to create commands for paired delimiters. For instance, if you put \DeclarePairedDelimiter\abs{\lvert}{\rvert} in your preamble then you get two commands for single-line vertical bars (they only work in math mode). The starred version, such as \abs*{\frac{22}{7}}, has the height of the vertical bars match the height of the argument. The unstarred version, such as \abs{\frac{22}{7}}, has the bars fixed at a default height. This version accepts an optional argument, as in \abs[size command]{\frac{22}{7}}, where the height of the bars is given in size command, such as \Bigg. Using \lVert and \rVert as the symbols will give you a norm symbol with the same behavior.

© 2007–2018 Karl Berry
Public Domain Software