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9 votes
2 answers
701 views

Reference for embeddings of reflection groups (related to folding ADE Coxeter graphs)?

There are a couple of indirect methods, using Lie theory or Springer's general theory of regular elements in (real, complex) reflection groups, to construct natural embeddings among certain Weyl ...
Jim Humphreys's user avatar
12 votes
0 answers
424 views

Reference for class of involutions containing longest element of finite Coxeter group?

Consider a finite (say irreducible) Coxeter group $W$ with a fixed generator set $S$ and rank $n$. This is the same thing as a finite real reflection group, generated by a set of “simple” ...
Jim Humphreys's user avatar
7 votes
1 answer
476 views

Centralizer of longest element in a finite irreducible Weyl group: related to folding of ADE graphs?

Say $(W,S)$ is a finite Coxeter group, such as a Weyl group (which satisfies an additional crystallographic condition). Assume also that $W$ is irreducible. Then it has a longest element $w_o$ ...
Jim Humphreys's user avatar