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Статья

Six-dimensional exceptional quotient singularities

Mathematical Research Letters. 2011. Vol. 18. No. 6. P. 1121-1139.

We classify six-dimensional exceptional quotient singularities and show that seven-dimensional exceptional quotient singularities do not exist. Inter alia we prove that the irreducible six-dimensional projective representation of the sporadic simple Hall–Janko group gives rise to an exceptional quotient singularity.