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How to write Latex symbol not in : \notin means "is not an element of", "is not a member of" or "does not belong to".
Latex symbol not in which means "is not an element of", "is not a member of" or "does not belong to" is the command: /notin
$x \notin A$
which gives
$x \notin A$
Here are few examples:
$\forall x \notin ]-1,+\infty[$
$\forall x \notin ]-1,+\infty[$
$\forall x \notin \mathbb{Q}$
$\forall x \notin \mathbb{Q}$