LaTeX Double Left Right Arrow (⇔) - Complete Guide
The double bidirectional arrow (⇔) represents logical equivalence (if and only if).
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Double Left Right Arrow
LaTeX Code
No package required
\LeftrightarrowDouble bidirectional arrow (if and only if)
What is the LaTeX Double Left Right Arrow?
The double bidirectional arrow (⇔) is used in formal logic to denote "if and only if", showing that two statements are logically equivalent and imply each other.
How to Use Double Left Right Arrow in LaTeX
Method 1: Using \Leftrightarrow
✅No package required
Double bidirectional arrow (if and only if)
Example: Using \Leftrightarrow
\documentclass{article}
\begin{document}
% Using the Double Left Right Arrow
Text with \Leftrightarrow
\end{document}Common Use Cases
The Double Left Right Arrow symbol is commonly used in the following contexts:
Logical Equivalence
Two statements are equivalent.
Code
$x^2 = 1 \Leftrightarrow x = \pm 1$Output
x² = 1 ⇔ x = ±1
Complete Examples
Equivalence
Logical equivalence
\documentclass{article}
\begin{document}
Two statements are equivalent:
$$2x = 10 \Leftrightarrow x = 5$$
\end{document}Frequently Asked Questions
Which method should I use?
We recommend using the method marked as "Recommended" above. However, the best method depends on your specific needs:
- \Leftrightarrow: Double bidirectional arrow (if and only if)
Where do I use this symbol?
This symbol can be used:
- In mathematical equations (math mode)
- In regular text (if using text mode)
- In various document environments
Can I use this in display mode?
Yes, symbols that work in math mode (between $ $) also work in display mode (between $$ $$). This allows you to display the symbol on its own line with larger formatting.
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