Description:

$\Sigma=\{0,1\}$, a map $f:\Sigma^* \to\Sigma^*$. To describe a string of 0 and 1 $\sigma$, the description is a map so that $f(\tau)=\sigma$.

Kolmogorov complexity $C_f$

$$C_f(x) = \begin{cases} min\{ \vert p \vert : f(p) = x & \text{if x} \\ \infty & \text{otherwise} \} \end{cases}$$

$f$ can be a universal turing machine.

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