12 Review of classical algorithmic randomness
We assume familiarity with the classical theory of algorithmic randomness and give a review of the subject in this chapter. For details see [111] and [24].
12.1 Randomness via measure theory
Intuitively, a random real should pass every feasible statistical test. This is the motivation for using measure theory to define randomness. In the language of measure theory, a test is associated with a null set. The following is a summary of the key notions of measure-theoretic randomness.
12.1.1 Kurtz and Schnorr randomness
The notion of (now called) Kurtz randomness was introduced in Kurtz [79].
Definition 12.1.1.
(i)A set A ⊆ 2ω is a Kurtz test if it is and μ(A) = 0;
(ii)a real x is Kurtz random if x ∉ ...
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