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computable number
A real number for which there is an algorithm that, given n, calculates the nth digit. Alan Turing was the first to define a computable number and the first to prove that almost all numbers are uncomputable. An example of a number that, even though well-defined, is uncomputable is Chaitin's constant.
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• COMPUTERS, ARTIFICIAL INTELLIGENCE, AND CYBERNETICS• TYPES OF NUMBERS
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