Straight ladder layout without breqn

Question

I would like to know how to obtain the Straight ladder layout as defined under 14.2.1 in the breqn package documentation. with the "normal" amsmath environments.

I tried

\documentclass{scrartcl}
\usepackage{amsmath}
\usepackage[utf8]{inputenc}
\begin{document}
\begin{align}
R &={} &&A + B + C + D
\
&&&+ E + F
\end{align}
\end{document}

but the spacing around "=" should be equal and not like this:

A second requirement is, that the resulting equation should get one number. The problem is that equation + split does not even allow more than one & for aligning.

score 3 · Answer 1 · answered Oct 20 '18 at 12:56

Like one of these, with aligned?

\documentclass{scrartcl}
\usepackage{amsmath}
\usepackage[utf8]{inputenc}
\usepackage{eqparbox}

\begin{document}

\begin{equation}
\begin{aligned}[b]
R =A + B & + C + D \\
 & + E + F
\end{aligned}
\end{equation}

\begin{equation}
\begin{aligned}
R ={} &\eqmakebox[A]{$ A $} + B + C + D \\
 &\eqmakebox[A]{${}+{}$}E + F
\end{aligned}
\end{equation}

\end{document}

score 1 · Answer 2 · answered Oct 21 '18 at 03:20

How about a combination of equation and alignedat?

\documentclass{scrartcl}
\usepackage{amsmath}
\usepackage[utf8]{inputenc}

\begin{document}
\begin{equation}
\begin{alignedat}{2}% <- Two pairs of right-/left-aligned columns
R & = {} & & A + B + C + D \\
  &      & & + E + F
\end{alignedat}
\end{equation}

\end{document}

mcocdawc · Answer 3 · 2018-10-21T11:03:21.693

1

Thank you very much for the solutions. I realized just now, that my question is not exactly a duplicate of, but gets answered here.

The approach with \hphantom is IMHO the cleanest and nicest one and looks exactly as I wanted it to be.

As one can see in the following example that it is now very intuitive to separate different summands in a term from other terms.

\documentclass{scrartcl}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage[utf8]{inputenc}

\begin{document}
\begin{equation}
\begin{split}
    R
  &=
    A + B + C + D
    \\ &\hphantom{{}={}}
    + E + F
    \\ &\hphantom{{}={}}
    + G + H
  \\
  &=
    A + B + C
    \\ &\hphantom{{}={}}
    + D + E
    \\ &\hphantom{{}={}}
    + F + G + H
\end{split}
\end{equation}



\end{document}

edited Oct 21 '18 at 11:03

answered Oct 21 '18 at 10:58

mcocdawc

323
2
7

+1. This helped me a lot! I noticed that you followed the proposal to launch a Materials Modeling stack exchange, however have not yet "committed" yet. At this point we need all the help we can get, would you mind to help us by committing? https://area51.stackexchange.com/proposals/122958/materials-modeling?referrer=MTRlZjUyNGY3MGY4ZWY5ZWZkZGVlNmY0NzY5ZjEzN2NjMjNlZTIwMjU0MWU0MDRjNjM2YjIxZmUxNGVhMWZlMHGM23pUo7y5cQ0jl0rBbYtJLWEPnIuIsvgjQSnSfyMm0 – user1271772 Apr 04 '20 at 19:39

score 1 · Answer 4 · answered Oct 21 '18 at 11:15

You can use a plain split, just moving the equals sign in the first column:

\documentclass{scrartcl}
\usepackage{amsmath}

\begin{document}
\begin{equation}
\begin{split}
R ={}
& A + B + C + D
\\
& + E + F
\end{split}
\end{equation}

\end{document}

Straight ladder layout without breqn

4 Answers4