# How to write a multi-line series of equations in LaTeX? [on hold]

I am trying to write those with $$$and$$$...but exactly this figure is not coming! How to write those in latex s.t. it is written in picture? Thanks!

## put on hold as off-topic by Raaja, JouleV, Stefan Pinnow, Tiuri, TeXnicianApr 19 at 10:44

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• If you use an equation environment, you don't need $...$ around it. Can you show us what you have tried that does not exactly give this figure? – user36296 Jan 16 at 15:30
• Those are coming but not exactly as in fig. i.e. line by line (as in the big.) – user454229 Jan 16 at 15:32
• Then please show us what code you have so far. I'm sure we can help you to make them line by line. – user36296 Jan 16 at 15:34
• Learn about align* environment. – manooooh Jan 16 at 15:34
• I'm voting to close this question as off-topic because this is just-do-it-for-me class of question. – Raaja Apr 19 at 6:42

Try to use the align environment.

\documentclass{article}
\usepackage{amsmath}
\begin{document}

\begin{align}
B' &=-\nabla \times E,\\
E' &=\nabla \times B - 4\pi j
\end{align}
\end{document}


Change the equations for those you need.

If you don't want them labeled put an * right after align like: \begin{align*} math \end{align*}

You can do it by using the amsmath package or the mathtools. Here is a MWE

    \documentclass{article}

\usepackage{mathtools}

\begin{document}
\begin{aligned}[t] \phi^\lambda_\sigma A_t &= \sum_{\pi\in C_t} sgn(\pi)\phi^\lambda_\sigma\phi^\lambda_\pi \\ &= \sum_{\tau\in C_{\sigma t}} sgn(\sigma^{-1}\tau\sigma)\phi^\lambda_\sigma\phi^\lambda_{\sigma^{-1}\tau\sigma}\\ &= A_{\sigma t \phi^\lambda_\sigma} \end{aligned}
\end{document}


A similar answer can be found here

In the line of Yourgos's answer, and to be more specific, if you want:

• no numbering at all, use either aligned inside equation* or align* (without equation).
• a single equation number for this multiline display, use aligned in equation
• one equation number per line , use align
• equation numbers one some lines, use align but add \nonumber on the lines to left unnumbered
• single equation number postfixed with a, b,c etc, enclose align environment inside subequation environment.