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Remarks on Hadamard groups. (English) Zbl 0889.05033
A group \(G\) of order \(8n\) is called an Hadamard group if there is a transversal \(D\) that intersects \(Da\) in exactly \(2n\) elements for every \(a\in G\) but a certain pair of involutions. Various conditions for a group to be Hadamard are studied.

MSC:
05B20 Combinatorial aspects of matrices (incidence, Hadamard, etc.)
20E22 Extensions, wreath products, and other compositions of groups
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