2.4 Irrelevances to the debate

Noise is a random input into a system's processes. Such randomness can be defined in several ways. It can be any sufficiently variable data which originates from outside the scope of a system's model of its world, and is thus unpredictable. It can be data which passes a series of statistical tests. It can be a pattern which is incompressible by a Turing machine.

In any case there are fully deterministic processes which produce sequences that are practically indistinguishable from random ones from any particular system's point of view. Thus a system with noise can be simulated by a model with the addition of such a process, such that the system does not have full access to the workings of that process.

In the opposite direction a noiseless system can be arbitrarily approximated by one that has noise, by suitable redundancy in its construction. This is how we maintain information in digital computers and our own genome.

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