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The LaTeX command for rank is \operatorname{rank} — rank of a matrix.
\operatorname{rank}Write \operatorname{rank} inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. This symbol needs the amsmath package, so add \usepackage{amsmath} to your preamble.
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Use \operatorname{rank} in math mode after adding \usepackage{amsmath} to your preamble. For example, $\operatorname{rank}_{i=1}^{n} x_i$.
It comes from the amsmath package — add \usepackage{amsmath} to your preamble.