Hello world!

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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]}]

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To write mathematics, simply enclose \(\LaTeX\)in sollar signs. ($).