Chapter 7: Mechanisms in Programs and Nature

Section 5: The Intrinsic Generation of Randomness

Sources of repeatable randomness

In using repeatability to test for intrinsic randomness generation, one must avoid systems in which there is essentially some kind of static randomness in the environment. Sources of this include the profile of a rough solid surface, or the detailed patterns of grains inside a solid.

From Stephen Wolfram: A New Kind of Science [citation]