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Gregory Chaitin

Gregory Chaitin, American contemporary mathematician and computer scientist who, beginning in the late 1960s, has made important contributions to algorithmic information theory, in particular a new incompleteness theorem similar in spirit to Gödel's incompleteness theorem.

Chaitin's work has profound consequences for our ideas of randomness.

Chaitin has defined Chaitin's constant Ω, a real number whose digits are randomly distributed and which expresses the probability that a random program will halt. Ω has numerous remarkable mathematical properties, including the fact that it is definable but not computable.

Chaitin's work on algorithmic information theory paralleled the work of Kolmogorov in many respects.


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