The Irrationality Exponents of Computable Numbers
classification
🧮 math.NT
keywords
computableirrationalitynumbersrealexponentnumberequalexponents
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We prove that a real number a greater than or equal to 2 is the irrationality exponent of some computable real number if and only if a is the upper limit of a computable sequence of rational numbers. Thus, there are computable real numbers whose irrationality exponent is not computable.
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