The LaTeX command for varnothing (∅) is \varnothing (variant empty set (preferred)).
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| Command | Package | Use it when |
|---|---|---|
\varnothing recommended | amssymb | Round empty set. |
\emptyset | none | Slashed zero, built in. |
\renewcommand{\emptyset}{\varnothing} | amssymb (preamble) | In the preamble: every \emptyset prints the round form. |
Write \varnothing inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
$A \cap B = \varnothing$Open this example in the live preview: it renders as you type, with no compiler and no signup.
\emptyset\mathbb{N}\mathbb{Z}\mathbb{Q}\mathbb{R}\mathbb{C}\mathbb{F}^\complement\bigcap\bigcup\bigsqcup\uplus\biguplus\mathcal{P}Set symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \varnothing in math mode after adding \usepackage{amssymb} to your preamble. For example, $A \cap B = \varnothing$.
It comes from the amssymb package: add \usepackage{amssymb} to your preamble.
\varnothing needs amssymb: without it pdfLaTeX stops with "Undefined control sequence".