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If an expression consists of more than one term, e.g., $x^2 + x$, is it necessary to add brackets to it when it is following an $\arg\max$ notation like $\arg\max(x^2 + x)$? I found that, in some papers, they do not use brackets under this kind of situations.

Haozheng Wang
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    The context is unclear because: arg() takes a complex number and returns a real; max() takes in this case a real function which could be either $x^2$ or $x^2+x$ which wouldn’t make sense for arg(). Please provide more context. – WindSoul Mar 10 '23 at 16:26
  • @WindSoul "Argmax(f)" has nothing to do with complex numbers. It is the value of the variable $x$ realizing the maximum of $f$ where $f:\mathbb{R}^n \to \mathbb{R}$ – Jean Marie Mar 10 '23 at 17:14
  • @JeanMarie, I trust you’re right, but where do you read that from? – WindSoul Mar 10 '23 at 17:30
  • @WindSoul https://en.wikipedia.org/wiki/Arg_max – Jean Marie Mar 10 '23 at 17:34

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