Horizontal distances in equations

I was wondering for a while how to set the horizontal distances inside the equations.
Well, here is a fairly goo description. See the original source here.

How to make two colums horisontally on LaTeX beamer slides

The easiest way to do this is to use \column as

 \begin{columns}[cc]

 \column{0.5\textwidth}
    some content ...
 \column{0.5\textwidth}
    some more content

\end {columns}