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Note on Hadamard groups of quadratic residue type. (English) Zbl 0793.05028
The purpose of this note is to prove the following proposition: Tetrahedral, octahedral and icosahedral groups are skew Hadamard groups.

MSC:
05B20 Combinatorial aspects of matrices (incidence, Hadamard, etc.)
05B05 Combinatorial aspects of block designs
20D60 Arithmetic and combinatorial problems involving abstract finite groups
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