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arxiv: 1006.0269 · v1 · submitted 2010-06-02 · 🧮 math.RT · math.GR

Certain subgroups of Weyl groups are split

classification 🧮 math.RT math.GR
keywords subgroupweylabeliancentralizercertaincomplexelementaryevery
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Let C be the centralizer in a finite Weyl group of an elementary abelian 2-subgroup. We show that every complex representation of C can be realized over the field of rational numbers. The same holds for a Sylow 2-subgroup of C.

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