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The unit sum numbers of rational groups are investigated: the importance of the prime 2 being an automorphism of the rational group is discussed and other results are achieved by considering the number and distribution of rational primes which are, or are not, automorphisms of the group. Proof is given of the existence of rational groups with unit sum numbers greater than 2 but of finite value .
Goldsmith, Brendan; Meehan, C.; and Wallutis, S., "On unit sum numbers of rational groups" (2002). Articles. Paper 34.