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On the laws of certain varieties of groups

Published online by Cambridge University Press:  17 April 2009

Robert B. Howlett
Affiliation:
Department of Pure Mathematics, University of Sydney, Sydney, New South Wales 2006, Australia;
Richard Levingston
Affiliation:
22 Swinden Street, Downer, ACT 2602, Australia.
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Abstract

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Let m and n be coprime positive integers. The variety (consisting of all groups G such that for some normal subgroup H of G, H is abelian of exponent dividing m and G/H is abelian of exponent dividing n) and the variety both satisfy the following three laws:

all elements have order dividing mn;

the commutator of two mth powers has order dividing m;

the commutator of two nth powers has order dividing n.

It is proved that any law which holds in both these varieties (notably that commutators commute) is a consequence of the above three laws.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1985

References

[1]Richard, Levingston, “The laws of some metabelian varieties”, J. Austral. Math. Soc. Ser. A 30 (1981), 469472.Google Scholar
[2]Hanna, Neumann, Varieties of groups (Ergebnisse der Mathematik und ihrer Grenzgebiete, 37. Springer-verlag, Berlin, Heidelberg, New York, 1967).Google Scholar