The space of functions of bounded mean oscillation $BMO$ is defined by the BMO norm
\begin{equation}
\label{norm}
||f||_{BMO} = \sup_{\text{cubes }Q} \frac{1}{|Q|} \int_Q |u(y) - u_Q| dy
\end{equation}

But an equivalent definition is to take the sup over balls instead of cubes ...

The space of functions of bounded mean oscillation or $BMO$ arises when studying the space of functions whos deviation from the mean over cubes is bounded.
In ways $BMO$ is similar to $L^\infty$, and it is often used as a replacement, however functions in $BMO$ may be ...

Recently I was working on porting my Python2 library gmpy_cffi to work under Python3 as well.
I'm using py.test to organise and run my tests.
Each test module is in it's own class, and so we have code that looks something like this

I'd like to start by talking about pelican, a neat python based static site
generator.
Pelican allows you to generate static content (HTML and CSS) from reStructuredText (RST) files.