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Does anyone know how to number an equation manually? I know using \begin{equation} automatically numbers the equation but I want to number it manually.

Like this:

ax=b                      2.1

ax=b                      2.2


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marked as duplicate by Mico equations Feb 26 at 12:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Any specific reason, why you want to number them manually? – samcarter Feb 25 at 17:20
up vote 13 down vote accepted

You can use the amsmath package and the \tag command. If you don't want the parenthesis, use \tag*.

        ax= b \tag{2.1}
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And still be able to use \label and \eqref! – egreg Feb 24 at 18:13

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