Generalized permutation matrix: Difference between revisions

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Signed permutation group: D_n is not in general the kernel of the determinant - it is defined by having an even number of negative elements.
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* It is the [[Coxeter group]] <math>B_n</math>, and has order <math>2^nn!</math>.
* It is the symmetry group of the [[hypercube]] and (dually) of the [[cross-polytope]].
* Its index 2 subgroup of matrices with determinant 1equal to their underlying (unsigned) permutation is the Coxeter group <math>D_n</math> and is the symmetry group of the [[demihypercube]].
* It is a subgroup of the [[orthogonal group]].