Joohyung Kim

collaborators

2 papers

math.CO2007

Some matrices associated with the split decomposition for a Q-polynomial distance-regular graph

Joohyung Kim

We consider a $Q$ -polynomial distance-regular graph $Γ$ with vertex set $X$ and diameter $D \geq 3$ . For $μ, ν \in {↓, ↑}$ we define a direct sum decom…

math.CO2007

A duality between pairs of split decompositions for a $Q$ -polynomial distance-regular graph

Joohyung Kim

Let $Γ$ denote a $Q$ -polynomial distance-regular graph with diameter $D \geq 3$ and standard module $V$ . Recently Ito and Terwilliger introduced four direct sum decompositions of $…

Some matrices associated with the split decomposition for a Q-polynomial distance-regular graph

A duality between pairs of split decompositions for a Q-polynomial distance-regular graph

A duality between pairs of split decompositions for a $Q$ -polynomial distance-regular graph