I added a sentence to that effect.
I have another question: the article claims that Us is a reflection about s, which I take to mean a reflection about the line through s, and this is correct. But Uω is not a reflection about ωx in the same sense. For the operator V to be a reflection about the vector w, we need to have Vw = w and Vx = -x whenever w and x are orthogonal. Uω doesn't have that property; it is a reflection at the plane spanned by all x≠ω. --AxelBoldt
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