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The align environment provided by AMS-LaTeX is used for two or more equations when vertical alignment is desired; usually equal signs are aligned. Use ampersands (&) for alignment and a double backslash (\\) to insert a linebreak.

Example[]

Markup
\begin{align}
  x-1 &= y \\
  x &= y+1
\end{align}
Renders as

It is even possible to use multiple alignment characters (&) per line:

Markup
\begin{align}
  x-1 &= y   &   a &= b+c \\
  x &= y+1   &   a-c &= b
\end{align}
Renders as
Markup
\begin{align}
  \frac{d}{dx} \ln x &= \lim_{h\to 0} \frac{\ln(x+h) - \ln x}{h} \\
  &= \ln e^{1/x} &&\text{How this follows is left as an exercise.}\\
  &= \frac{1}{x} &&\text{Using the definition of ln as inverse function}
 \end{align}
Renders as

Preamble[]

To use align, import the amsmath package in your preamble with \usepackage{amsmath}.

See also[]

  • flalign (bigger horizontal gaps, allows for left-aligning equations)
  • alignat (smaller horizontal gaps)
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