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Elementary equivalence and the commutator subgroup

Published online by Cambridge University Press:  18 May 2009

L. P. D. van den Dries
Affiliation:
Yale University, New Haven, Connecticut, U.S.A.
A. M. W. Glass
Affiliation:
Bowling Green State University, Bowling Green, Ohio, U.S.A.
Alan H. Mekler
Affiliation:
University of Western Ontario, London, Ontario, Canada
John Poland
Affiliation:
Carleton University, Ottawa, Ontario, Canada
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If G and H are elementarily equivalent groups (that is, no elementary statement of group theory distinguishes between G and H) then the definable subgroups of G are elementarily equivalent to the corresponding ones of H. But G′ of G, consisting of all products of commutators [a, b] = a−1b−1ab of elements a and b of G, may not be definable. Must G′ and H′ be elementarily equivalent?

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Type
Research Article
Copyright
Copyright © Glasgow Mathematical Journal Trust 1982