Abstract

We further develop the theory of $$W$$ -graph ideals, first introduced in Howlett (J Algebra 361:188–212, 2012). We discuss $$W$$ -graph subideals, and induction and restriction of $$W$$ -graph ideals for parabolic subgroups. We introduce $$W$$ -graph biideals: those $$W$$ -graph ideals that yield $$(W\times W^{{\mathrm {o}}})$$ -graphs, where $$W^{{\mathrm {o}}}$$ is the group opposite to $$W$$ . We determine all $$W$$ -graph ideals and biideals in finite Coxeter groups of rank 2.

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