most citedReflection subgroups of finite and affine Weyl groups

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math.GR2009★ 1 cited

Reflection subgroups of finite and affine Weyl groups

M. J. Dyer, G. I. Lehrer

We discuss the classification of reflection subgroups of finite and affine Weyl groups from the point of view of their root systems. A short case free proof is given of the well kn…