2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67737Let $Γ$ denote a $Q$-polynomial distance-regular graph with diameter at least three and standard module $V$. We introduce two direct sum decompositions of $V$. We call these the displacement decomposition for $Γ$ and the split decomposition for $Γ$. We describe how these decompositions are related.14 pagesCombinatorics05E30The displacement and split decompositions for a $Q$-polynomial distance-regular graphtext