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Relative difference sets in semidirect products with an amalgamated subgroup. (English) Zbl 1067.05013
In recent years there has been growing interest in the construction of non-abelian examples of semiregular relative difference sets. The authors give a new construction method by using what they call semidirect product with amalgamated subgroups, that is, a group \(G\) with subgroups \(G_1\) and \(G_2\) such that \(G=G_1G_2\) and both \(N=G_1 \cap G_2\) and \(G_1\) are normal in \(G\). Given relative difference sets with parameters \((m_l,n,m_l,\frac{m_l}{n})\) in two groups \(G_l\) (\(l=1,2\)), relative to normal subgroups \(N_l\) of \(G_l\), the authors give a sufficient condition (the existence of a compatible coupling) for the existence of a relative difference set with parameters \((m_1^im_2^j, n,m_1^im_2^j, \frac{m_1^im_2^j}{n})\) in some semidirect product with amalgamated subgroup \(N \cong N_1 \cong N_2\) for all positive integers \(i\) and \(j\). They also discuss several examples for this construction.

MSC:
05B10 Combinatorial aspects of difference sets (number-theoretic, group-theoretic, etc.)
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