arXiv subjects

K. Palpandi

Publications and source records attributed to K. Palpandi.

5 recordsLinked to original sources

arXiv2026

On the Eccentricity Laplacian and Eccentricity Signless Laplacian Matrices of a Graph

In this paper, we introduce the Laplacian and the signless Laplacian for the eccentricity matrix of a connected graph, referred to as the eccentricity Laplacian and the eccentricity signless Laplacian, respectively. We establish the equivalence among the eccentricity Laplacian, eccentricity signless Laplacian, and eccentricity spectrum for different classes of graphs. We provide spectral characterization of $\mathcal{E}$-bipartite graphs by the symmetry of $\mathcal{E}$-spectrum and the similarity of these Laplacian matrices.

math.CO↗

arXiv2025

On Column sufficiency and Extended Horizontal Linear Complementarity Problem

In this article, we introduce the concept of the column-sufficient W-property for a set of matrices and prove the convexity of the solution set for the Extended Horizontal Linear Complementarity Problem. Additionally, we present an uniqueness result and establish several results related to the column-sufficient W-property.

math.OC↗

arXiv2023

The Horizontal Tensor Complementarity Problem

This article explores a new type of nonlinear complementarity problem, namely the horizontal tensor complementarity problem (HTCP), which is a natural extension of the horizontal linear complementarity problem studied in [12]. We extend the concepts of R_0, R, and P pairs from a pair of linear transformations given in [9] to a pair of tensors. When a given pair of tensors has these properties, we use degree-theoretic tools to discuss the existence and boundedness of solutions to the HTCP. Finally, we study an uniqueness result of the solution of the HTCP.

math.OC↗

arXiv2023

A Criterion for ${\rm Q}$-tensors

A tensor ${\mathcal A}$ of order $m$ and dimension $n$ is called a ${\rm Q}$-tensor if the tensor complementarity problem has a solution for all ${\bf q} \in {\mathbb R}^{n}$. This means that for every vector ${\bf q}$, there exists a vector ${\bf u}$ such that ${\bf u} \geq {\bf 0},{\bf w} = {\mathcal A}{\bf u}^{m-1}+{\bf q} \geq {\bf 0},~\text{and}~ {\bf u}^{T}{\bf w} = 0$. In this paper, we prove that within the class of rank one symmetric tensors, the ${\rm Q}$-tensors are precisely the positive tensors. Additionally, for a symmetric ${\mathrm Q}$-tensor ${\mathcal A}$ with $rank({\mathcal A})=2$, we show that ${\mathcal A}$ is an ${\mathrm R}_{0}$-tensor. The idea is inspired by the recent work of Parthasarathy et al. \cite{Parthasarathy} and Sivakumar et al. \cite{Sivakumar} on ${\rm Q}$-matrices.

math.OC↗

arXiv2023

Generalizations of R0 and SSM properties; Extended Horizontal Linear Complementarity Problem

In this paper, we first introduce R0-W and SSM-W properties for the set of matrices which is a generalization of R0 and the strictly semimonotone matrix. We then prove some existence results for the extended horizontal linear complementarity problem when the involved matrices have these properties. With an additional condition on the set of matrices, we prove that the SSM-W property is equivalent to the unique solution for the corresponding extended horizontal linear complementarity problems. Finally, we give a necessary and sufficient condition for the connectedness of the solution set of the extended horizontal linear complementarity problems.

math.OC↗