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On (Not) Computing the Möbius Function Using Bounded Depth Circuits

Published online by Cambridge University Press:  24 August 2012

BEN GREEN*
Affiliation:
Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA, UK (e-mail: b.j.green@dpmms.cam.ac.uk)
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Abstract

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Any function F: {0,. . ., N − 1} → {−1,1} such that F(x) can be computed from the binary digits of x using a bounded depth circuit is orthogonal to the Möbius function μ in the sense that

\[\frac{1}{N} \sum_{0 \leq x \leq N-1} \mu(x)F(x) → 0 \quad\text{as}~~ N → \infty.\]
The proof combines a result of Linial, Mansour and Nisan with techniques of Kátai and Harman, used in their work on finding primes with specified digits.

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Copyright © Cambridge University Press 2012