Folding subgroups of Coxeter groups have Poincaré series given by simple formulas in q-integers, yielding new combinatorial identities on length statistics.
Coxeter groups in Coxeter groups
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The Poincar\'e Series of Coxeter Folding Subgroups
Folding subgroups of Coxeter groups have Poincaré series given by simple formulas in q-integers, yielding new combinatorial identities on length statistics.