Test note

2026-02-24 15:36 UTC

Central part of the Philips circle pattern
Philips PM5544 test card, by Wikipedia user ebnz, CC BY 2.5.

Hello, world!

This is just a test.

Euler's identity is \(e^{i\pi}+1=0\), while the Fourier transform formula is

\[ \hat{f} (\xi)=\int_{-\infty}^{\infty}f(x)e^{-2\pi ix\xi}dx \]

Here follows a beautiful plot.

2D plot of 3 functions