Jae-Ho Lee

activity

20172022

most citedCircular Hessenberg Pairs

3 citations · 3 across the 2 of their papers we have counts for

collaborators

5 papers

math.CO2022★ 3 cited

Circular Hessenberg Pairs

Jae-Ho Lee

A square matrix is called Hessenberg whenever each entry below the subdiagonal is zero and each entry on the subdiagonal is nonzero. Let $M$ denote a Hessenberg matrix. Then $M$ is…

math.CO2022

A New Feasibility Condition for the AT4 Family

Zheng-Jiang Xia, Jae-Ho Lee, Jack H. Koolen

Let $Γ$ be an antipodal distance-regular graph with diameter $4$ and eigenvalues $θ_{0} > θ_{1} > θ_{2} > θ_{3} > θ_{4}$ . Then $Γ$ is tight in the sense of Jurišić, Koolen, and Terwilliger [12] when…

math.CO2021

Remarks on pseudo-vertex-transitive graphs with small diameter

Jack H. Koolen, Jae-Ho Lee, Ying-Ying Tan

Let $Γ$ denote a $Q$ -polynomial distance-regular graph with vertex set $X$ and diameter $D$ . Let $A$ denote the adjacency matrix of $Γ$ . For a vertex $x \in X$ and for $0 \leq i \le…

math.CO2018

Grassmann graphs, degenerate DAHA, and non-symmetric dual $q$ -Hahn polynomials

Jae-Ho Lee

We discuss the Grassmann graph $J_{q} (N, D)$ with $N \geq 2 D$ , having as vertices the $D$ -dimensional subspaces of an $N$ -dimensional vector space over the finite field $F_{q}$ …

math.CO2017

Dual Polar Graphs, a nil-DAHA of Rank One, and Non-Symmetric Dual q-Krawtchouk Polynomials

Jae-Ho Lee, Hajime Tanaka

Let $Γ$ be a dual polar graph with diameter $D ⩾ 3$ , having as vertices the maximal isotropic subspaces of a finite-dimensional vector space over the finite field $\mathbb{…

Circular Hessenberg Pairs

A New Feasibility Condition for the AT4 Family

Remarks on pseudo-vertex-transitive graphs with small diameter

Grassmann graphs, degenerate DAHA, and non-symmetric dual q-Hahn polynomials

Dual Polar Graphs, a nil-DAHA of Rank One, and Non-Symmetric Dual q-Krawtchouk Polynomials

Grassmann graphs, degenerate DAHA, and non-symmetric dual $q$ -Hahn polynomials