A function f(n), defined on
the positive rational integers, is said to be additive if and only if for every pair of
coprime integers a and b the relation
is satisfied. Thus an additive function is determined by its values on those integers
which are prime powers. In an extensive paper Erdos raised the question of
characterising those real valued additive functions which have a limiting distribution
( mod 1).
It is our present purpose to give such a characterisation.
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