pyKalman #It's something List A B C: d e \ref{0001} <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=default"></script> $$x_{1,2} = \frac{-b \pm \sqrt{b^2-4ac}}{2b}.$$ Some math: $\varphi\colon X\to Y$