Is it possible to number equations when posting questions at physics stack exchange, or any other stack exchange site enabled with MathJax?
I have tried \begin{equation} \end{equation}
.
Yes, there is a \tag{}
command. E.g.
$$ 1+1=2 \tag{1} $$
produces
$$ 1+1=2 \tag{1} $$
\tag
is used. $\endgroup$