[O] LaTeX equation align in orgmode?

[Rainer M Krug]

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---
#+LATEX_HEADER: \usepackage{amsmath}

* The equations

\begin{equation}
\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{equation}
--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---

but eqnarray is apparently bad (see link above).

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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