Latex: how to break a line inside $$

Question

I want to manually break a line inside $$:

$$something something <breakline> something else$$

I tried \\, \newline, and \linebreak but none work. Ideas?

Harlandharle

Don't use $$ for display math; you should instead use \[ … \]. – Lipkin

thanks. this doesn't work however – Harlandharle

And why do you want to break the line anyway? Let's see the actual text, not “something something etc.” because what you want will either be covered by an existing environment and you should use the right one, or just be bad typesetting practice. – Lipkin

@sgm: Why not use $$? Donald Knuth does. – Bicentenary

Answer 1

A couple of people have suggested eqnarray which will work, but a better approach is the align environment in the amsmath package.

\begin{align*}
something \\
something else
\end{align*}

If you want the two parts aligned in some way, use an & as described in the amsmath documentation.

Sternlight

Answer 2

Instead of using the TeX-style $$ commands, consider using the align* or gather* environments. Inside those, you can use the line break command \\.

(You will need to load the amsmath package to use those; but if you're doing any math at all, you should be loading that package regardless.)

Fictional

Documentation at en.wikibooks.org/wiki/LaTeX/… – Jacobean

Answer 3

11 years later...

An example of breaking text in multiple lines is having a cell with multiple lines in an array. Instead of using a new array row, you can break the text in lines within a cell. The advantage of doing this is interline space is not dependent on the whole row height (if some cell in the row has a large height, this won't influence the text interline space):

To do this, just enclose the cell content within curly braces and use \\ as a linebreak.

Content of the highlighted cell:

{ T_f (u) \text { is the transformed function and }
  \\
  K (t,u) \text { is the kernel used. }}

Whole code:

$\begin {array} {lll}
\text {Transform: } T_f (u) 
    & = \int \limits_{t_1}^{t^2} K (t,u) f(t) dt \;\; \textrm {where:}
        & {
            T_f (u) \text { is the transformed function and }
            \\
            K (t,u) \text { is the kernel used. }
          }
          \\
\text {Inverse transform: } f(u) 
    & = \int \limits_{u_1}^{u^2} K^{-1} (t,u) T_f(u) du
\end {array}$

Bagby

Answer 4

The way to get line breaks in display math, while using only standard LaTeX, is to use \begin{array}...\end{array} within the display math environment $$...$$. (Yes, I know that $$ is deprecated but I still like it.) There are many alternatives in different extensions, including AMSLaTeX's align and align* environments. My personal favorite is Didier Rémy's mathpartir package, which gives a display-math environment that is more like paragraph mode, plus a set of tools for typesetting logical inference rules and proof trees.

Micrography

Answer 5

Try something like this:

    \documentclass[varwidth,margin=3mm]{standalone}
    \usepackage{amsmath}
    \begin{document}
        \begin{math}
                \alpha(e1)=c1,\ \alpha(e2)=c3\\
                \alpha(e3)=c5,\ \alpha(e4)=c2\\
                \alpha(e5)=c4,\ \alpha(e1)=c1\\
        \end{math}
    \end{document}

---

The varwidth parameter is the key.
With it you can properly utilize \linebreak, \newline, \\, etc.
I used \begin{math} / \end{math}, but you should be able to use the old $ / $$ notation too.

Obadias

Answer 6

I think a simple solution in many cases (when a math mode is present inside a paragraph) can be to just split the single line $---segment1-----|--segment2-----$ in math mode (where a split is desired at the symbol "|") to two consecutive segment each inside math mode as $---segment1-----$$--segment2-----$.

Predigest

Answer 7

For me the following worked:

\begin{equation}\label{eq:Aind}
\begin{aligned}
C(\omega) = \int_0^{\omega} cos(\frac{\pi}{2} \nu^2) d\nu \\
S(\omega) = \int_0^{\omega} sin(\frac{\pi}{2} \nu^2) d\nu \\
\end{aligned}
\end{equation}

Octangle

Answer 8

You could use an eqnarray* instead.

Allyl

sorry, don't understand how you're suggesting to use this. Can you add an example. – Harlandharle

gather and align much better option – Plenary