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If I have a string of equations whose equal signs are aligned and one of the equations is too long and needs to span multiple lines, how do I create a second alignment. For instance, in the following example

      &           +eqn2_part3\\  

How do I align the equals signs and the plus signs.

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up vote 5 down vote accepted

Using boxes via \phantom is also an option, if alignment characters like && get in the way for long equations:

enter image description here

\usepackage{amsmath}% http://ctan.org/pkg/amsmath

A correction for the spacing around binary operators ({}+) and relations ({}=) is required though. See Herbert's mathmode document for more on AMS environments and alignment.

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You could use alignat which is also from the amsmath package.

enter image description here




  f(x)&=eqn1                    &&   \\  
      &=eqn2_part1              && +eqn2_part2 \\   
      &                         && +eqn2_part3\\  
      &=eqn3                    &&   \\   
      &=eqn4                    &&   \\  


You'll notice that the alignat environment takes an argument- which is (quoting from the documentation)

the number of “equation columns”: count the maximum number of &s in any row, add 1 and divide by 2.

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When I compile I get a large gap between eqn2_part1 and the plus signs when the length of eqn3 and 4 are longer than eqn2_part1. – richtera Jun 1 '12 at 16:18
@richtera perhaps you could add your code to your question so that folks can play with it? – cmhughes Jun 1 '12 at 16:31

Please try breqn package. Then use \begin{dmath}...\end{dmath} environment. For example

\documentclass[12pt]{article} %


enter image description here

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