$$(0, + \infty ] = \{ x \in \Bbb R: x > 0 \}$$
$$\mathrm{Lighter \ boxes \ are \ better.}$$
light-grey is too dark a field background, so I tried #eae9e6 instead... maybe even lighter than that is better?
hello $\to$ there $\mathbb{R}$
$$\mathrm{S} =
\begin{bmatrix}
\mathrm{x} & \mathrm{a,b,c} \\
\mathrm{y} & \mathrm{z} \\
\end{bmatrix}$$
So, $\ \mathrm{sector_{11}} = \mathrm{\{x\}}$, $\ \mathrm{sector_{12}} = \mathrm{\{a,b,c\}}$, $\ \mathrm{sector_{21}} = \mathrm{\{y\}}$, $\ \mathrm{sector_{22}} = \mathrm{\{z\}}$
( $\ \mathrm{S_{\alpha \beta}}\ $ instead of $\ \mathrm{sector_{\alpha \beta}}\ $ ? )
So, $\ \mathrm{sector_{11}} = \mathrm{\{x\}}$, $\ \mathrm{sector_{12}} = \mathrm{\{a,b,c\}}$, $\ \mathrm{sector_{21}} = \mathrm{\{y\}}$, $\ \mathrm{sector_{22}} = \mathrm{\{z\}}$
( $\ \mathrm{S_{\alpha \beta}}\ $ instead of $\ \mathrm{sector_{\alpha \beta}}\ $ ? )
This slghtly warm background colour is suits my tastes better. Warm = friendly and confident. This is now Source Code Pro, btw.
I personally think the bigger padding is so much easier to read, but that's me. The default body font is so perfect, Kasper. So clear and easy to read!
However, I would probably knock the page background down from the pure white that it is now to something like this.
StackEdit.io's style for comparison: $(0, + \infty ] = \{ x \in \Bbb R: x > 0 \}$
hello
Source Code Pro is a much better monospaced font than the system-default (usually courier)