Subscripts are commonly used when creating a document. In this tutorial we will discuss how to use subscripts in LaTeX, both in text mode and math mode.

## Use subscript in math mode

Using subscripts in math mode is very easy, you just need to use this character `_`

(underscore). For example if you want to print O₂ then you have to write the syntax like this `\[ O_2 \]`

.

```
\documentclass{article}
\usepackage{amsmath} % For \longrightarrow
\begin{document}
\[ \verb|H_2 O|\longrightarrow H_2 O \]
\[ \Lambda_0\quad\Lambda_e\quad\Lambda_\nu \]
\[ \sum_n \quad \bigcup_m\quad \int_0 \]
\[ (a_0,a_1,a_2,\dots,a_n) \]
\end{document}
```

**Output : **

If you want to use more than one character in the subscript, pass the characters in curly brackets `{}`

.

Moreover, the first characters will be printed as subscript and the remaining characters will be printed as normal text.

So if you want to print A_{n+1} then the syntax will be `A_{n+1}`

.

```
\documentclass{article}
\usepackage{amsmath} % For \longrightarrow
\begin{document}
\[ \verb|A_n+1|\longrightarrow A_n+1 \]
\[ \verb|A_{n+1}|\longrightarrow A_{n+1} \]
\[ \Lambda_{pq}\quad\Lambda_{\mu e}\quad\Lambda_{\nu a} \]
\[ \sum_{n=1} \quad \bigcup_{m=1}\quad \int_{2\pi} \]
\[ (a_0,a_1,a_2,\dots,a_{(n-1)},a_n) \]
\end{document}
```

**Output : **

Also you can use single dollar to use superscript in inline mode. Like this `$O_2$`

```
\documentclass{article}
\begin{document}
What is $O_2$ used for?\\[4pt]
What is $H_2 SO_4$ called in chemistry?\\[4pt]
Summation in Mathematics is denoted by the symbol $ \sum $ and for a set of real numbers $ x_1, x_2, \cdots, x_n $, their sum is defined as $ \sum_{k=1}^{n}x_k $ . That is
\end{document}
```

**Output : **

## Subscript in usual text mode

LaTeX provides a default command to use subscripts in the text mode of LaTeX, which is `\textsubscript`

. With this command you can easily use subscript in usual text mode.

```
\documentclass{article}
\usepackage{amsmath} % For \longrightarrow
\begin{document}
\verb|A\textsubscript{n-1}|$\longrightarrow$ A\textsubscript{n-1}\\[4pt]
What is O\textsubscript{2} used for?\\[4pt]
What is H\textsubscript{2}SO\textsubscript{4} called in chemistry?\\[4pt]
(a\textsubscript{0},a\textsubscript{1},a\textsubscript{2},$\dots$,a\textsubscript{n-1},a\textsubscript{n})
\end{document}
```

**Output : **

## Multiple(double) subscript in LaTeX

If you want to use double subscripts, write the syntax `a_{b_c }`

or `{a_b}_c`

rather than `a_b_c`

.

And if you write like this `a_b_c`

you will get error message. Also you can write triple subscript like this `a_{b_{c_d}}`

.

```
\documentclass{article}
\usepackage{amsmath} % For \longrightarrow
\begin{document}
\verb|a_{b_c}|$\longrightarrow a_{b_c}$\\[5pt]
\verb|{a_b}_c|$\longrightarrow {a_b}_c $\\[5pt]
\verb|a_{b_{c_d}}|$\longrightarrow a_{b_{c_d}} $\\[5pt]
\verb|a_{1_{2_{3_{\ddots_{n}}}}}|$\longrightarrow a_{1_{2_{3_{\ddots_{n}}}}} $
\end{document}
```

**Output : **