On bipartite \(Q\)-polynomial distance-regular graphs with \(c_2 \leqslant 2\)
Summary: Let \(\Gamma\) denote a bipartite \(Q\)-polynomial distance-regular graph with diameter \(D \geqslant 4\), valency \(k \geqslant 3\) and intersection number \(c_2 \leqslant 2\). We show that \(\Gamma\) is either the \(D\)-dimensional hypercube, or the antipodal quotient of the \(2D\)-dimensional hypercube, or \(D=5\).
scientific article; zbMATH DE number 6389224