How to write underbrace symbol in LaTeX?

Underbrace is a single curly bracket that is used below the expression. For example

You can use this underbrush symbol in different ways.

Latex has many methods to represent this symbol. And in all cases, there are structural differences between the symbols. This tutorial will cover all the methods so that you can find the solution to all the questions in your mind in this tutorial.

Properties Value
Symbol Underbrace
Argument Yes
Command \underbrace
Example \underbrace{abcd} Use default package for underbrace symbol.

First, the \underbrace command in latex is defined without any packages. That is, you can use directly this command to represent this symbol. For example

\documentclass{article}
\begin{document}
  $$ \underbrace{a_1+a_2+a_3+ \cdots + a_n} $$
  $$ \underbrace{x_1+x_2}+\underbrace{x_3+x_4} $$
  $$ \underbrace{\textit{physicsread.com}} $$
\end{document}

Output :

Mathematical equation with underbrace symbol.

Use multiple methods for underbrace symbol in LaTeX

Here multiple packages have been used to explain multiple methods. And each package contains the same command \underbrace but has structural differences, as shown in the table below.

Package Command
MnSymbol \underbrace{abcd} Use MnSymbol package for underbrace symbol.
fdsymbol \underbrace{abcd} Use fdsymbol package for this symbol.
stix \underbrace{abcd} Use stix package for this symbol.
mathtools \underbrace{abcd} Use mathtools package for this symbol.
mathabx \underbrace{abcd} Use mathabx package for this symbol.
abraces \underbrace{abcd} Use mathabx package for this symbol.

However, the \aunderbrace command has been used for the abraces package.

Multiple lines underbrace expression in LaTeX

You may have noticed that different text, number is written under the underbrace. And to represent this syntax, you need to use a subscript with this command.

\documentclass{article}
\usepackage{stix}
\begin{document}
  $$ \underbrace{a_1+a_2+\cdots+a_n}_{\textit{n term}}+\underbrace{x_1+x_2+\cdots+x_m}_{\textit{m term}} $$
  $$ \underbrace{a^2+2ab+b^2}_{(a+b)^2}=\underbrace{a^2+2a+1}_{(a+1)^2} $$
\end{document}

Output :

In this image, the text is written under the underbrace.

And the expression is passed as an argument in the subscript to display the expression below the underbrace symbol.

Use underbrace below matrix in LaTeX

To use a curly bracket under a matrix, the entire matrix environment must be passed within that \underbrace command as an argument.

\documentclass{article}
\usepackage{stix,amsmath}
\begin{document}
 $$\underbrace{
   \begin{pmatrix}
    a_{1,1} & a_{1,2} & \cdots & a_{1,n} \\
    a_{2,1} & a_{2,2} & \cdots & a_{2,n} \\
    \vdots  & \vdots  & \ddots & \vdots  \\
    a_{m,1} & a_{m,2} & \cdots & a_{m,n} 
   \end{pmatrix}}_{m \times n}$$
\end{document}

Output :

Matrix elements are represented above undarbrace symbol.

 

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