nostr:npub19xsxvf0439eckg4d37h0gv3vrkrcceumphenm89vzsldltg78l8sg9ay28 texgen
\begin{equation}
F(t)= \sum_{x=0}^{N-1} f(x) \exp\left(-i\frac{2 \pi t x}{N} \right)
\end{equation}