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M. Levin's construction of absolutely normal numbers with very low discrepancy (1510.02004v1)

Published 2 Oct 2015 in math.NT and cs.DS

Abstract: Among the currently known constructions of absolutely normal numbers, the one given by Mordechay Levin in 1979 achieves the lowest discrepancy bound. In this work we analyze this construction in terms of computability and computational complexity. We show that, under basic assumptions, it yields a computable real number. The construction does not give the digits of the fractional expansion explicitly, but it gives a sequence of increasing approximations whose limit is the announced absolutely normal number. The $n$-th approximation has an error less than $2{2{-n}}$. To obtain the $n$-th approximation the construction requires, in the worst case, a number of mathematical operations that is double exponential in $n$. We consider variants on the construction that reduce the computational complexity at the expense of an increment in discrepancy.

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