Leila Parsaei-Majd

collaborators

3 papers

math.CO2021

Zero-sum flows for Steiner systems

Saieed Akbari, Hamid Reza Maimani, Leila Parsaei Majd +1

Given a $t$ - $(v, k, λ)$ design, $D = (X, B)$ , a zero-sum $n$ -flow of $D$ is a map $f : B ⟶ {\pm 1, \dots, \pm (n - 1)}$ such that fo…

math.CO2020

Spectral symmetry in conference matrices

Willem H. Haemers, Leila Parsaei Majd

A conference matrix of order $n$ is an $n \times n$ matrix $C$ with diagonal entries $0$ and off-diagonal entries $\pm 1$ satisfying $C C^{⊤} = (n - 1) I$ . If $C$ is symmetric, then $C$ …

math.CO2020

On sign-symmetric signed graphs

Ebrahim Ghorbani, Willem H. Haemers, Hamid Reza Maimani +1

A signed graph is said to be sign-symmetric if it is switching isomorphic to its negation. Bipartite signed graphs are trivially sign-symmetric. We give new constructions of non-bi…