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In my macro file, I have defined two commands

\newcommand{\SO}[1]{\mathsf{SO}(#1)}
\newcommand{\so}[1]{\mathfrak{so}(#1)}

There are two exact same commands with the only difference is in case. When I use it in my main file, I get the following error:

LaTeX Error: Command \so already defined

The worrying part is, this was working before but now it has stopped working. Am I missing some package or something? If I do, what package would it be?

Thanks!

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    Yes, you can. But not if one of them is already defined by something else (a package or a class). It looks like you maybe added a package to your document that does define \so.
    – Qrrbrbirlbel
    Sep 21, 2022 at 13:24
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    \so is defined in the soul package. Do you use it? And \so, \SO, \So and \sO are four different commands, so you have other possibilities.
    – Przemysław Scherwentke
    Sep 21, 2022 at 13:36
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    Yes, the soul package was added in my document but I was not using it. So commenting it out works for me. Thanks a lot! :)
    – Autonomous
    Sep 21, 2022 at 13:40

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