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How to write Latex symbol belongs to : \in means "is an element of", "a member of" or "belongs to".
Latex symbol belongs to or is an element of: \in
$x \in A$
which gives:
$x \in A$
Here are few examples.
$\forall x \in ]-\infty,\infty[$
$\forall x \in ]-\infty,\infty[$
$\forall x \in \mathbb{R}$
$\forall x \in \mathbb{R}$