I'm trying to write a system of equations in LaTeX. From the Wiki page Advanced Mathematics I took this example:

        B'&=-\partial \times E,\\
        E'&=\partial \times B - 4\pi j,
 \qquad \text{Maxwell's equations}

but as a result I got:

! LaTeX Error: Environment aligned undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.

l.49  \left.\begin{aligned}

Does anybody know what goes wrong here?

  • 1
    Please provide a minimal working example. We can definitely assist you better in that way. More than likely, from the error message, your missing the amsmath package which defines the aligned environment. – azetina Nov 14 '13 at 20:24

I found the answer:


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