latex

# How to Write and Use the Real Number Symbols in LaTeX

A fixed set of real numbers is a fixed set of rational and irrational numbers in arithmetic. Unique capital R symbols commonly represent this set, usually Blackboard Bold R or Double-Struck R. It consists of rational numbers with wonderful and interesting integers, fractions, and irrational numbers.

You can use these symbols in LaTeX, but it is essential to use the specific codes to write them. If you are interested in learning how to write the real number in LaTeX, we recommend that you read this tutorial thoroughly. This tutorial will explain the approach to writing the different types of real number symbols in LaTeX.

## How to Write and Use the Real Number Symbols in LaTeX

Multiple packages and commands are available to use the real numbers in LaTeX. Real numbers are typically represented by a double-struck capital R (RR). You can write it using the \mathbb{} command with different packages. Let’s explore with the {amsfonts} package. Here is the simple source code:

\documentclass{article}

\usepackage{amsfonts}

\begin{document}

$$X,Y\in\mathbb{R}$$

\end{document
}

You can get the following result by compiling the source code in the document processor:

Similarly, you can use the {amssymb} and {txfonts} packages to get the exact same results. However, if you want to bold the real number, you can use the {pxfonts} package:

\documentclass{article}

\usepackage{pxfonts}

\begin{document}

$$X,Y\in\mathbb{R}$$

\end{document
}

Let’s compile the previous source code to get this result:

## Double Struck R Without Any Package

The more interesting fact is that we can also build a similar dual-stroke capital R using the fundamental Roman typeface without including the extra symbols from the outside packages by converting the typeface within the math mode to Roman. And after writing a capital I and a capital R to each other by eliminating the gap between them with the \! command. Here’s the source code:

\documentclass{article}

\usepackage{amsfonts}

\begin{document}

${\rm I\!R}$

\end{document
}

After compiling the source code, you will get the following result:

The output of ${\rm I\!R}$ produces IR, which may not look as nice as an amssymb but still tricks.

## Conclusion

LaTeX is one of the best document processors for writing, enhancing, and publishing medical documents. The Real number symbol using LaTeXis beneficial and, at some points, a powerful resource. This was the brief information about the real number symbol using the LaTeX commands. The results are visible on the LaTeX panel. We also added an alternative that you can use for writing a real number symbol in LaTeX.