Graph folding produces affine subgroups of W(An), W(Dn), W(En) with identical Coxeter numbers, yielding W(Cn), W(Bn), W(F4), W(H3) and W(H4) plus a general dihedral construction for planar quasicrystals.
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Affine subgroups of the affine Coxeter group with the same Coxeter number
Graph folding produces affine subgroups of W(An), W(Dn), W(En) with identical Coxeter numbers, yielding W(Cn), W(Bn), W(F4), W(H3) and W(H4) plus a general dihedral construction for planar quasicrystals.