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Borel's normal number theorem

Published online by Cambridge University Press:  14 February 2019

W. J. A. Colman*
Affiliation:
64 Shooters Hill Road, Blackheath, LondonSE3 7BG

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We shall present some new proofs concerning the distribution of the digits in decimals. We finish with a proof of Borel's normal number theorem. The proof given here is more direct and straightforward than the one given in [1]. This theorem is concerned with the distribution of the digits within infinite decimals. The actual statement of the theorem will be given later after some intermediate results have been established. The theorem is not only unexpected but seemingly counter-intuitive. In order to follow the arguments given here it is useful to have a numerical example as we will count the decimals and then their digits. We shall deduce the results for a general base b.

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Copyright © Mathematical Association 2019