I have an answer that has a number of equations. Within the text of the answer I just want to refer to the number of the equation. I saw it on an answer somewhere, but I can find such an answer now. What is the markup?
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$\begingroup$ Welcome to meta! We have a nice sandbox which is occasionally a good self-teaching guide, and almost always made dirty by our doodles. But you can find all things formatting there. $\endgroup$ – M.A.R. Nov 7 '15 at 12:26
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2+2=4\tag{1}
$2+2=4\tag{1}$
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$\begingroup$ Never heard of such. Maybe that's because I'm inclined to write comparatively short answers, so manual numbering would suffice. $\endgroup$ – Ivan Neretin Jan 11 '16 at 5:37
