The LaTeX command for arg is \arg (argument (complex numbers)).
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Write \arg inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
\arg sets the name upright with operator spacing; typed as plain letters it would print in italics, as a product of variables.
$\arg_{i=1}^{n} x_i$Open this example in the live preview: it renders as you type, with no compiler and no signup.
\log\ln\det\dim\ker\gcd\deg\hom\operatorname{sgn}\operatorname{tr}\operatorname{rank}\operatorname{diag}\operatorname{span}\operatorname*{argmax}Math operators in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \arg in math mode; it needs no extra package. For example, $\arg_{i=1}^{n} x_i$.
None: \arg is built into LaTeX, so no extra package is required.