How to Write Sigma Symbol (σ) in LaTeX

In LaTeX, you can write the sigma symbol using the \sigma command for the lowercase sigma (σ) and the \Sigma command for the uppercase sigma (Σ).

The following examples show how to write the sigma symbol in LaTeX.

How to Write the Sigma Symbol in Text

We can use the \sigma command to write the lowercase sigma symbol in LaTeX document for text.

Suppose we want to write the sigma symbol in the text.

We can use the following LaTeX code to do so:

\documentclass{article}
\begin{document}

This is an example of using the sigma symbol \(\sigma\) in a sentence.

\end{document}

Output: 👇️

This is an example of using the sigma symbol σ in a sentence.

In this example, we use the \sigma command to display the lowercase sigma symbol in the text.

How to Write the Sigma Symbol in Mathematical Expressions

For mathematical expressions, we can use the \sigma command to ensure proper formatting.

Suppose we would like to write mathematical expressions that contain the sigma symbol.

We can use the following LaTeX code to do so:

\documentclass{article}
\begin{document}

An inline mathematical expression: \( \alpha + \beta = \sigma \).

A displayed mathematical expression:
\[
\alpha^2 + \beta^2 = \sigma^2
\]

\end{document}

Output: 👇️

In this example, we use the \sigma to denote the sigma symbol in both inline and displayed mathematical expressions.

Conclusion

We can use the \sigma command for both text and mathematical expressions. This ensures that the sigma symbol is properly formatted and displayed in LaTeX document.