TeXipedia

lmoustache

Represents a large left moustache delimiter, used in mathematical expressions requiring tall, curved opening brackets.

Overview

Serves as a specialized mathematical delimiter primarily found in advanced mathematical typesetting where standard parentheses or braces are insufficient.

  • Commonly paired with \rmoustache to create matching delimiter pairs
  • Particularly useful in displaying large mathematical structures like matrices or multi-line equations
  • Often appears in professional mathematical publications and advanced algebra texts
  • Provides a more elegant alternative to standard delimiters when extra vertical height is needed

Examples

Left moustache bracket in a complex mathematical expression showing nested grouping.

⎰1x2+1y2⎱=z\left\lmoustache \frac{1}{x^2} + \frac{1}{y^2} \right\rmoustache = z 
\left\lmoustache \frac{1}{x^2} + \frac{1}{y^2} \right\rmoustache = z

Using moustache brackets to enclose a system of equations.

⎰x+y=12x−y=3\left\lmoustache\begin{array}{l} x + y = 1 \\ 2x - y = 3 \end{array}\right. 
\left\lmoustache\begin{array}{l} x + y = 1 \\ 2x - y = 3 \end{array}\right.

Moustache bracket enclosing a matrix representation.

A=⎰abcd⎱A = \left\lmoustache\begin{array}{cc} a & b \\ c & d \end{array}\right\rmoustache 
A = \left\lmoustache\begin{array}{cc} a & b \\ c & d \end{array}\right\rmoustache