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Published online by Cambridge University Press: 24 October 2008
1. Any number x between 0 and 1 may be expressed uniquely in the form
where xr is a non-negative integer less than r (r = 2,3,…). We consider the set E of numbers x for which
We establish an inequality connecting the dimensional number of the set E with certain constants of the series
in particular we show that, when ξτ = rθ, the dimensional number of E is θ. We are concerned with the measure of Hausdorff.
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§ We write s − m*E in place of t s − m*E where there can be no ambiguity.
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† For if 0 <f−mE<∞ and then g−mE = ∞.
† I am indebted to the referee here for a considerable simplification of the argument.