2

How to make the label of equation at the end of the equation?

and not in the middle of equation using \begin{split}

enter image description here

My MWE:

\begin{equation}
\begin{split}
A =& A+ B \\
  =& A-C \\
  =& d + f -d \\
  =& 1234
\end{split}
\end{equation}


\begin{equation}
A =  1234
\end{equation}
2
  • 1
    Off-topic: In order to get the typographically correct amount of spacing around the = symbols, it's essential to write &= rather than =&.
    – Mico
    May 3, 2020 at 14:25
  • @Mico. Thanks.It is strange that both way =& and &= works. But i guess &= is better. But I could not see the difference
    – aan
    May 3, 2020 at 14:27

3 Answers 3

5

With the environment DispWithArrows of witharrows (which is similar to align of amsmath), you have an option to specify that you want to tag only the last line.

You may also fix globally this option with \WithArrowsOptions{tagged-lines = last}.

Of course, the first aim of witharrows is to add arrows in such alignments and that's why I've added an arrow.

\documentclass[12pt]{book}
\usepackage{witharrows}
\begin{document}
\begin{DispWithArrows}[tagged-lines = last]
A & = A+ B \\
  & = A-C \Arrow{an arrow} \\
  & = d + f -d \\
  & = 1234
\end{DispWithArrows}
\end{document}

Result of the above code

3
  • Thanks. What happened if I want to specific a line to be label (either line 2, line 3). I posted another questions.
    – aan
    May 3, 2020 at 14:28
  • Take a closer look at the space around the = signs. The & should precede it: &=. May 3, 2020 at 18:39
  • @ Babara Beeton: You re right. I have modified. May 3, 2020 at 19:13
6

enter image description here

If this features is desired in whole document, than the asmath's option tbtags solve your problem:

\documentclass{article}
\usepackage[tbtags]{amsmath}

\begin{document}
\begin{equation}
\begin{split}
A & = A+ B      \\
  & = A-C       \\
  & = d + f -d  \\
  & = 1234
\end{split}
\end{equation}

\begin{equation}
A =  1234
\end{equation}
\end{document}
5
  • @Zarco ... see the second comment in my answer ... (+1)
    – koleygr
    May 3, 2020 at 12:56
  • +1. Do please change all instances of = & to &=, though.
    – Mico
    May 3, 2020 at 14:23
  • @Zarko, Thanks. What happened if I want to specific a line to be label (either line 2, line 3). I posted another questions. tex.stackexchange.com/questions/542050/…
    – aan
    May 3, 2020 at 14:28
  • @Mico, you are right. I (again) overlooked this misplacing in OP question. Corrected!
    – Zarko
    May 3, 2020 at 14:40
  • 2
    @aan, I clearly stated that use of tbtag influence on all similar cases in document. If you like to change placement in just one occasions, than you should stick with other answers.
    – Zarko
    May 3, 2020 at 14:44
4

Try like this:

\documentclass[12pt,twoside,draft]{book}
\usepackage{amsmath}


\begin{document}



\begin{align}\nonumber
A &= A+ B \\\nonumber
  &= A-C \\\nonumber
  &= d + f -d \\
  &= 1234
\end{align}



\begin{equation}
A =  1234
\end{equation}
\end{document}

enter image description here

5
  • Generally, you should stack two separate align/equation environments like that. It'd be better to include the equation into the align (and I'd probably have \nonumber just before \\ , since that's the line it's modifying).
    – Teepeemm
    May 3, 2020 at 12:33
  • 3
    With =& in the align, we don't have the right space after the =. You should use &= instead. May 3, 2020 at 12:49
  • @Teepeemm It is just an example I suppose and I can't know if one align could be ok for the op ... He could possibly have already used one and not two, bat mau be you are right... About the \nonumber LaTeX doesn't really care if it is before or after the equation ...
    – koleygr
    May 3, 2020 at 12:54
  • @F.Pantigny ... Yes ... right ... just copy pasted and didn't try to improve the code ... just added the code in a align environment and could nor right all that in a comment (it shows terrible ...) [Thanks ... fixed!]
    – koleygr
    May 3, 2020 at 12:55
  • \notag is equivalent to \nonumber, and is shorter to type. May 3, 2020 at 18:41

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