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

Recommended
\Leftrightarrow

Double 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

latex
\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

latex
\documentclass{article}
\begin{document}

Two statements are equivalent:
$$2x = 10 \Leftrightarrow x = 5$$

\end{document}

Frequently Asked Questions about Double Left Right Arrow (⇔)

Which LaTeX code should I use for Double Left Right Arrow?

For the Double Left Right Arrow symbol (⇔), 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 can I use the Double Left Right Arrow symbol?

The Double Left Right Arrow symbol (⇔) is typically used:

  • In mathematical equations (math mode)
  • In regular text (if supported)
  • In various LaTeX environments

Can I use the Double Left Right Arrow symbol in display mode?

Yes, the Double Left Right Arrow symbol (⇔) works in display mode (between $$ $$). This allows you to render the symbol on its own line with better visibility.

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