I have used GMS class to write design a math book. In that book, the author has a special theorem, as following:


\section{Indent the subsection}
\begin{theorem}Here is theorem 1
\begin{theorem}This theorem must be numbered as theorem 2A

As you can see in the MWE, there are two theorems. I want to number the second theorem to theorem 2A, and the next theorem to that is theorem 3 as usual.

How can I do? Please help me.



Temporarily adjust the theorem counter presentation:

enter image description here

\begin{theorem}This theorem must be numbered as theorem 2A

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