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The LaTeX command for indicator function (π) is \mathbb{1} β indicator function / characteristic function.
\mathbb{1}Write \mathbb{1} inside math mode β that is, between $β¦$ for inline math or in a \[ β¦ \] / equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
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\mathbb{E}\mathbb{P}\operatorname{Var}\operatorname{Cov}\operatorname{Cor}\mathcal{N}\perp\!\!\!\perp\xrightarrow{d}\xrightarrow{p}\xrightarrow{a.s.}\overset{\text{iid}}{\sim}Search all 380+ LaTeX symbols β
Use \mathbb{1} in math mode after adding \usepackage{amssymb} to your preamble. For example, $\mathbb{1}$.
It comes from the amssymb package β add \usepackage{amssymb} to your preamble.