Subscripts and superscripts
Introduction
The use of superscripts and subscripts is very common in mathematical expressions involving exponents, indexes, and in some special operators. This article explains how to write superscripts and subscripts in simple expressions, integrals, summations and so forth.
Definite integrals are some of the most common mathematical expressions, so let's see an example:
\[ \int\limits_0^1 x^2 + y^2 \ dx \]
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This LaTeX code produces:
\[ \int\limits_0^1 x^2 + y^2 \ dx \]
By convention, superscripts and subscripts in LaTeX are created using the characters ^
and _
respectively; for example, the exponents applied to \(x\) and \(y\) in the code fragment above. Those characters can also be used with mathematical symbols, such as the integral (\int
) included in the example above where _
is used to set the lower limit and the ^
for the upper limit.
The command \limits
changes the way the limits are displayed in the integral, if not present the limits would be next to the integral symbol instead of being on top and bottom:
\[ \int_0^1 x^2 + y^2 \ dx \]
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This LaTeX code produces:
\[ \int_0^1 x^2 + y^2 \ dx \]
More detailed examples
The symbols _
and ^
can also be combined in the same expression, for example:
\[ a_1^2 + a_2^2 = a_3^2 \]
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This LaTeX code produces:
\[ a_1^2 + a_2^2 = a_3^2 \]
If the expression contains long superscripts or subscripts, these need to be collected in braces, as LaTeX normally applies the mathematical commands ^
and _
only to the following character:
\[ x^{2 \alpha}  1 = y_{ij} + y_{ij} \]
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This LaTeX code produces:
\[ x^{2 \alpha}  1 = y_{ij} + y_{ij} \]
Subscripts and superscripts can be nested and combined in various ways. When nesting subscripts/superscripts, however, remember that each command must refer to a single element; this can be a single letter or number, as in the examples above, or a more complex mathematical expression collected in braces or brackets. For example:
\[ (a^n)^{r+s} = a^{nr+ns} \]
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This LaTeX code produces:
\[ (a^n)^{r+s} = a^{nr+ns} \]
Operators using subscripts and superscripts
Some mathematical operators may require subscripts and superscripts. The most frequent cases are those of the integral \int
(check the introduction) and the summation (\sum
) operators, whose bounds are typeset precisely with subscripts and superscripts.
\[ \sum_{i=1}^{\infty} \frac{1}{n^s}
= \prod_p \frac{1}{1  p^{s}} \]
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This LaTeX code produces:
\[ \sum_{i=1}^{\infty} \frac{1}{n^s} = \prod_p \frac{1}{1  p^{s}} \]
For other frequently used operators that require subscripts/superscripts check the reference guide.
Open all code fragments in Overleaf
Use the link provided below to open all the examples above as a single Overleaf project:
Here are some examples of simple usage of subscripts and superscripts:
\[ \int\limits_0^1 x^2 + y^2 \ dx \]
\vspace{1cm}
Using superscript and subscripts in the same expression
\[ a_1^2 + a_2^2 = a_3^2 \]
\vspace{1cm}
Longer subscripts and superscripts:
\[ x^{2 \alpha}  1 = y_{ij} + y_{ij} \]
\vspace{1cm}
Nested subscripts and superscripts
\[ (a^n)^{r+s} = a^{nr+ns} \]
\vspace{1cm}
Example of a mathematical equation with subscripts and superscripts
\[ \sum_{i=1}^{\infty} \frac{1}{n^s} = \prod_p \frac{1}{1  p^{s}} \]
\vspace{1cm}
Squared root usage
\[ \sqrt[4]{4ac} = \sqrt{4ac}\sqrt{4ac} \]
Open all the examples above as a single Overleaf project.
Reference guide
Additional examples and operators
LaTeX markup  Renders as 

a_{n_i}


\int_{i=1}^n


\sum_{i=1}^{\infty}


\prod_{i=1}^n


\cup_{i=1}^n


\cap_{i=1}^n


\oint_{i=1}^n


\coprod_{i=1}^n

There are also bigcup
and bigcap
commands similar to cup
and cap
but those are used for larger expressions.
Further reading
For more information see
 List of Greek letters and math symbols
 Operators
 Integrals, sums and limits
 Mathematical fonts
 Brackets and Parentheses
 The Great, Big list of LaTeX Symbols (a full list of available mathematical symbols in the amssymb package)
 The not so short introduction to LaTeX2ε
 Aligning equations with amsmath
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