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The LaTeX command for emdash (—) is --- — em dash.
---Write --- inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. It is part of core LaTeX math, so no extra package is required.
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\textcopyright\textregistered\texttrademark\pounds\texteuro\yen\dag\ddag\S\P\textbullet\dots--\textasciitildeSearch all 380+ LaTeX symbols →
Use --- in math mode — it needs no extra package. For example, $---$.
None — --- is built into LaTeX's math mode, so no extra package is required.