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A question of Babai on groups

Published online by Cambridge University Press:  17 April 2009

J.L. Hickman  and
B.H. Neumann
J.L. Hickman
Affiliation:
Department of Mathematics, Institute of Advanced Studies, Australian National University, Canberra, ACT
B.H. Neumann
Affiliation:
Division of Mathematics and Statistics, Commonwealth Scientific and Industrial Research Organization, Canberra, ACT.
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Abstract

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László Babai raised the question whether every infinite group G contains a set B of elements, of cardinal equal to the order of G, such that for elements a, b, c of B the equation a = bc−1b implies a = c. We show that the answer is affirmative for certain classes of groups, including the soluble groups and the countable groups, if the Axiom of Choice is assumed, but negative, even for abelian groups, if a different axiom, compatible with Zermelo-Fraenkel set theory but incompatible with the Axiom of Choice, is assumed.

Information

Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 13 , Issue 3 , December 1975 , pp. 355 - 368
Copyright
Copyright © Australian Mathematical Society 1975

References

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