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## [O] LaTeX equation align in orgmode?

 From: Rainer M Krug Subject: [O] LaTeX equation align in orgmode? Date: Mon, 28 Sep 2015 21:10:43 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (darwin)

Hi

I would need in a document several equations which are aligned as in
http://tex.stackexchange.com/a/167908/6941

How can I use the following latex formula in orgmode?

--8<---------------cut here---------------start------------->8---
\begin{proof} The proof is a follows: \begin{align} (x+y)^3&=(x+y)(x+y)^2\\ &=(x+y)(x^2+2xy+y^2)\\ &=x^3+3x^2y+3xy^3+x^3.\qedhere \end{align}\end{proof}
--8<---------------cut here---------------end--------------->8---

I have effectrively

--8<---------------cut here---------------start------------->8---

* The equations

\begin{align} (x+y)^3&=(x+y)(x+y)^2\\ &=(x+y)(x^2+2xy+y^2)\\ &=x^3+3x^2y+3xy^3+x^3.\qedhere \end{align}
--8<---------------cut here---------------end--------------->8---

but with latex fragment preview (C-c C-x C-l) I only get an empty frame.

How can use this align environment in org?

I could use

--8<---------------cut here---------------start------------->8---
\begin{eqnarray*}
\hat{f}(x) & \propto & \sum_{\nu} \frac{|F(\nu)H(\nu)|^2}{|N(\nu)|^2}
\frac{G(\nu)}{H(\nu)} e^{\frac{2 \pi i \nu x}{N}}\\
& \propto & \sum_{\nu} \frac{|F(\nu)|^2}{|N(\nu)|^2} H(\nu) H^*(\nu)
\frac{G(\nu)}{H(\nu)} e^{\frac{2 \pi i \nu x}{N}}\\
& \propto & \sum_{\nu} H^*(\nu) G(\nu) e^{\frac{2 \pi i \nu x}{N}}
\end{eqnarray*}
--8<---------------cut here---------------end--------------->8---

Thanks,

Rainer

--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

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