<p><strong>My Mathjax commands</strong> (makes life easier)</p>
<p>\newcommand{\p}[2]{\frac{\partial #1}{\partial #2}} \newcommand{\f}[2]{\frac{ #1}{ #2}} \newcommand{\l}[0]{\left(} \newcommand{\r}[0]{\right)} \newcommand{\mean}<a href="https://physics.stackexchange.com/questions/324115/books-on-undergraduate-experimental-physics">1</a>{\langle #1 \rangle}\newcommand{\e}[0]{\varepsilon} \newcommand{\ket}<a href="https://physics.stackexchange.com/questions/324115/books-on-undergraduate-experimental-physics">1</a>{\left|#1\right&gt;} \newcommand{\bra}<a href="https://physics.stackexchange.com/questions/324115/books-on-undergraduate-experimental-physics">1</a>{\left&lt;#1\right|} \newcommand{\braoket}[3]{\left&lt;#1\right|#2\left|#3\right&gt;}</p>

Quantum spaghettification