vertical alignment symbols from two different equations

Question

I would like to align equations from two different lines.

\documentclass[12pt]{article}
\begin{document}
$$ a = b +1 = c +2 = d +3$$
The quick brown fox jumps over the lazy dogs.
$$ a = b$$ 
\end{document}

This sample document centers the equations separately. I would like to have the math-mode symbols a = b to align vertically.

enter image description here

Use align or align* environment then, for example? ;-) See also http://tex.stackexchange.com/questions/503/why-is-preferable-to?s=1|1.6833 please — , Aug 05 '15 at 21:20
Also, if you want the text inbetween the equations, use \intertext{...} or \shortintertext{...}. — sodd, Aug 05 '15 at 21:22
Try: \begin{align*} a &= b +1 = c +2 = d +3\\ \intertext{The quick brown fox jumps over the lazy dogs.} a &= b \end{align*} — AboAmmar, Aug 05 '15 at 21:41
Never use $$ in LaTeX, see Why is \[ … \] preferable to $$? — egreg, Aug 05 '15 at 21:59

score 2 · Answer 1 · 2015-08-05T21:55:29.000

2

Two 'equivalent' ways, effectively

\documentclass[12pt]{article}
\usepackage{mathtools}
\begin{document}
\begin{alignat*}{3}
   a &= b + 1   &{}= c + 2 &= d + 3 \\
   \shortintertext{The quick brown fox jumps over the lazy dogs.}
   a &= b   
\end{alignat*}

\begin{align*}
   a &= b + 1   = c + 2 = d + 3 \\
   \shortintertext{The quick brown fox jumps over the lazy dogs.}
   a &= b   
\end{align*}

\end{document}

edited Aug 05 '15 at 21:55

answered Aug 05 '15 at 21:24

1

You should add a {} before the 2nd = sign on the first line, or replace the 2nd and 3rd &= with &&=. – Bernard Aug 05 '15 at 21:52
@Bernard: Yes, you're right, does improve the look. I will change the code here and the image. Thanks! – Aug 05 '15 at 21:55
Or &&= to get to the next left aligned column; but I don't see why using alignat when a simple align works. – egreg Aug 05 '15 at 21:58
@egreg: True, just as an alternative... – Aug 05 '15 at 22:00
@egreg: The second line might include other alignment points. – Bernard Aug 05 '15 at 22:27

vertical alignment symbols from two different equations

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