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I have the code $$\phi< \Arg_{\phi}(z)\leq \phi + 2\pi$$ which is meant to give a non-italicised Arg subscripted by phi. This shows when arg is lower case but now when it is capitalised. Could anyone help me fix this? Thanks.

THN
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    \Arg is not defined by default. I assume you're using amsmath then here is how to properly define it \DeclareMathOperator\Arg{Arg}, use \DeclareMathOperator* if you want ti to behave lime \lim regards to limits. – daleif Feb 11 '20 at 17:09
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    And next time please provide a minimal example, it is kind of the standard request around here (it lets us know what kind of class and preamble you are using as that till affect our answers) – daleif Feb 11 '20 at 17:10

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\Arg is not defined by default.

Assuming you are using amsmath (you should) \Arg can be defined via

\DeclareMathOperator\Arg{Arg}

Use \DeclareMathOperator* if you want limits on \Arg to behave lime for \lim.

If this is a one time use only, you can use

\operatorname{Arg}

Additionally, don't use $$...$$ it is not LaTeX and does not comply to LaTeX configurations, se Why is \[ ... \] preferable to $$ ... $$? for more info

daleif
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