\form#0:$\frac{\sin(x)}{x}$
\form#1:$|c|^2$
\form#2:$out(k) = in(k) \cdot scale$
\form#3:$out(k) = in(k) \cdot e^{j \cdot rps \cdot k}$
\form#4:$(f * g)[n] = \sum_{m=-\infty}^{\infty} f[m] \; g[n-m]$
\form#5:$(f \star g)[n] = \sum_{m=-\infty}^{\infty} f^*[m] \; g[n+m]$
\form#6:$|x|^2$
