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I'd like to take notes for a math class such that I can typeset a series of equations with the \align environment and make some text notes in between some of the lines. As far as I can tell, though... by using \end{align*}, typing some text notes about the process, and then starting a new \begin{align*}, I won't be able to align the = symbols in the above environment with & anymore.

The best I could come up with is to use \text{} in the middle of the equations, but that doesn't place the text along the left margin of the document.

\documentclass{article}

\usepackage[fleqn]{mathtools}

\begin{document}
  This is a series of equations:
  \begin{align*}
    x^{2}+y^{2}&=0\\
    y&=mx+b\\
    \text{This is a note about the above lines}\\
    &\text{This is another note}\\
    x^{2}&=1
  \end{align*}
\end{document}
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2  
Try \intertext and \shortintertext. –  mafp Mar 4 '13 at 14:54
    
That's neat - didn't know about those. What is the difference between those two? –  agent154 Mar 4 '13 at 14:59
    
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marked as duplicate by egreg, mafp, Werner, Paul Gaborit, Andrew Swann Mar 4 '13 at 15:46

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1 Answer

amsmath provides \intertext, which interrupts your align, and lets you add some text. Sometimes, however, the spacing around the \intertext is too large, so the mathtools package provides \shortintertext. Compare:

\usepackage{mathtools}

\begin{align}
a & = b \\
\intertext{Some note.}
c & = d \\
\shortintertext{Another note.}
e & = f
\end{align}
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