# Is there an opposite to \nonumber? [duplicate]

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?
• 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 9:33
• @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 9:35