CODEWITHSUNDEEP
latexequation
Anna
Anna

Reputation: 4159

How do I break a long equation over lines?

I am trying to add an equation in a new line. The problem is that the equation is too long for the line, and I need to break it manually. Otherwise, it just overlaps to the right column, or to the right margins (and looks ugly...). Is there a way LaTeX can brake the equation for me, so it seems nice?

I'm attaching my latex code:

\begin{align*}
f(n)-f(0) &= A(n)-B(n)-C(n)-D(n)\cdot d-\left(A(0)-B(0)-C(0)-D(0)\cdot d\right) \\
          &= A(n)-0-X-D(n)\cdot d-\left(0-0-0-0\right) \\
          &= A(n)-X-D(n)\cdot d
\end{align*}

The problematic line is the first line, which is too long.

Upvotes: 26

Views: 72102

Answers (4)

Will Robertson
Will Robertson

Reputation: 64580

The breqn package is designed to split long equations automatically. It works very well in the majority of situations, but it's not as mature as the amsmath package. Here's how you'd write your example equation:

\documentclass{article}
\usepackage{breqn}
\begin{document}
\begin{dmath}
f(n)-f(0) = A(n)-B(n)-C(n)-D(n)\cdot d-\left(A(0)-B(0)-C(0)-D(0)\cdot d\right)
          = A(n)-0-X-D(n)\cdot d-\left(0-0-0-0\right)
          = A(n)-X-D(n)\cdot d
\end{dmath}
\end{document}

Note there is no markup for alignment or newlines, but the output looks essentially the same as if you used align.

Upvotes: 14

Stephen Canon
Stephen Canon

Reputation: 106197

I usually prefer to handle this by using the amsmath package and using the split structure. There are a bunch of useful structures in there for splitting equations across lines, but that's usually the simplest to use.

Many TeX installations will already have the package, but you can also get it from the AMS website.

Upvotes: 10

ire_and_curses
ire_and_curses

Reputation: 70162

The standard approach I've used in the past is an eqnarray. See for example this page.

Upvotes: 2

Martijn
Martijn

Reputation: 5653

As far as I know, this is not possible. When working inside a display, you are responsible for line breaks. How to line break, and how to continue on the next line in case of brackets, is a tough question for humans (check, for instance, the relevant section in Grätzer, "Math into LaTeX"), let alone for a computer.

Example: when you break the first line after \left(, you need a \right. at the end, and \left. at the beginning of the next line (otherwise you'll get an error). Moreover, you'd want the beginning of the next line to be further right than the bracket produced by \left(

Upvotes: 0

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