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Below, I wrote what I want to express (and its output) without optidef. Since all other optimization problem equations in this paper are written in optidef, I would like this one to be as well. However, I cannot figure it out and would appreciate any help.

\begin{equation}
    \max_{\textbf{x} \in \mathcal{X}} f(\textbf{x}) = \min_{\textbf{x} \in \mathcal{X}} -f(\textbf{x})
\end{equation}

enter image description here

Muhammad Mir
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    Welcome! It's not clear why you want to use something meant for a different target. By the way, it should be \mathbf{x} and not \textbf{x}. – egreg Jan 18 '24 at 18:42
  • Are you unsure about what to write, or about how to write it? The first question is off-topic here (you could try the [Math.SE] site), the second question is on-topic but then you need to provide the answer to the first question first. – Marijn Jan 18 '24 at 21:04
  • I think you are looking for https://tex.stackexchange.com/a/112820/128658 – Raven Jan 19 '24 at 16:08
  • Thank you for the suggestions. What I am unsure about is how to write it. For example, I know if I wanted to describe the LHS using the optidef package it would be: 
    \usepackage{optidef}
\begin{mini}|l|
    {\textbf{x} \in \mathcal{X}}{f(\mathbf{x})}
    {}{}
\end{mini}

    What I'm looking to do is use the optidef package to write what I wrote in my question above. I hope this clarified the question.

     – Muhammad Mir Jan 19 '24 at 19:19

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