# zbMATH — the first resource for mathematics

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