Multiplication is Superfunction
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Theorem
The function $f: \C \to \C$, defined as:
- $\map f z = z \times c$
is a superfunction for any complex number $c$.
Proof
Define $h: \C \to \C$ by $\map h z = z + c$.
Then:
\(\ds \map h {\map f z}\) | \(=\) | \(\ds \map h {z \times c}\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds z \times c + c\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds \paren {z + 1} \times c\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds \map f {z + 1}\) |
Thus $\map f z = z \times c$ is a superfunction and $\map h z = z + c$ is the corresponding transfer function.
$\blacksquare$