Unary Minus

There is a special unary minus in FAUST:

$$\begin{tabular}{rcl} \texttt{-x} & $\to$\ & \texttt{0,x : -} \end{tabular}$$

Thus, assuming x denotes a signal, -x is the same as 0-x (the negated signal) while -(x) is a block diagram (not a signal) having one input from which x is subtracted (and usually read as ``minus of x'').

As another example, -(1+cos(w)) is a single-input, single-output block diagram in which the output of (1+cos(w)) (a signal) is subtracted from the input signal, while -1-cos(w) denotes a signal (no input).