Discrete Fourier Transform
F(t) := \sum_{k=0}^{N-1} f(t)e^{- \frac{2 \pi i k}{N} t}
F(t):=∑k=0N−1f(t)e−N2πikt
\documentclass{article}
\usepackage{graphicx}
\usepackage{tikz}
\begin{document}
% eccetera eccetera
\end{document}Discrete Fourier Transform
\color{red} {F(t)} := \sum_{k=0}^{N-1} f(t)e^{- \frac{2 \pi i k}{N} t}
F(t):=∑k=0N−1f(t)e−N2πikt
\documentclass{article}
\usepackage{graphicx}
\usepackage{tikz}
\begin{document}
% eccetera eccetera
\end{document}