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The LaTeX command for varnothing (∅) is \varnothing — variant empty set (preferred).
\varnothingWrite \varnothing inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
$A \varnothing B$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type — no compiler, no signup.
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Use \varnothing in math mode after adding \usepackage{amssymb} to your preamble. For example, $A \varnothing B$.
It comes from the amssymb package — add \usepackage{amssymb} to your preamble.