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import numpy as np
np.sqrt(1/2)
i = 0
while i <= 0:
        print(i)
        i = i +1

\documentclass{minimal}
\begin{document}
Hello World!
\end{document}

sudo nano dooropener.py
(out)No such file or directory!

StreamDensityPlot[{\[Eta], -Sin[\[Theta]]}, {\[Theta], -\[Pi], \
\[Pi]}, {\[Eta], -5, 5}, ColorFunction -> Hue, 
 PlotLegends -> Automatic, FrameLabel -> {\[Theta], \[Eta]}]

This is a test of the MathJax config:

\[\hat H \ket{\psi} = E \ket{\psi}\]

Does mhchem work?

\[\ce{3H2(g) + N2(g) <=>[Heat][Pressure] 2NH3(g)}\]

And of course, the Maxwell’s Equations in differential form in ams align:

\begin{align} \div \vec E &= \frac{\rho}{\varepsilon_0}\\\div \vec B &= 0 \\ \curl \vec E &= – \pdv{\vec B}{t}\\ \curl \vec H &= \vec J + \pdv{\vec D}{t} \end{align}

Biot-Savart law, closure relation, and Stoke’s Theorem in align*:

\begin{align*}\vec B(P) = \frac{\mu_0}{4\pi}\int \frac{\vec I \times \hat r’}{r’^2}\dd{l} &= \frac{\mu_0}{4\pi}I \int \frac{\dd{\vec l}\times \hat r’}{r’^2} \\ \int_{\mathbb{R}^3} \dd[3]{r}\ket{\vec r}\bra{\vec r} &= \mathbb{1} \\ \int_{\partial \Omega} \omega &= \int_\Omega \dd{\omega}\end{align*}