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Usually I set equations using the align environment together with \nonumber for those few lines that shall not have a number, or the align* environment if no equation shall be numbered. But what if there are only few equations in a an align block that shall be numbered? In that case, adding \nonumber to almost all lines is a bit annoying, so is there anything like \donumber in an align* environment?

Tobias Kienzler
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    You may be using the wrong tools and possibly split or aligned might help you. Can you give an example of a use case? – egreg Apr 30 '13 at 09:33
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    Related questions: http://tex.stackexchange.com/questions/42726/align-but-show-one-equation-number-at-the-end?lq=1 http://tex.stackexchange.com/questions/17528/show-equation-number-only-once-in-align-environment?rq=1 – Torbjørn T. Apr 30 '13 at 09:34
  • @egreg A longer derivation of an expression where e.g. two immediate results are important enough to deserve a label. – Tobias Kienzler Apr 30 '13 at 09:34
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    @TorbjørnT. Thanks, the \numberthis command (\newcommand\numberthis{\addtocounter{equation}{1}\tag{\theequation}}) from this answer solves it, marking as duplicate – Tobias Kienzler Apr 30 '13 at 09:35

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