I noticed this term on this post.
But the term arg inf is not clearly defined.
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$\begingroup$It refers to the argument of the function such that the function attains its infimum (or minimum). For example, let $f(x) = x^2-x$. Then $\arg\inf f(x) = {1\over 2}$ because $f(x)$ attains its minimum at $x= {1\over 2}$.
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