M. Ebrahimi

activity

20122023

most citedPerturbed N=(2,2) supersymmetric sigma models on Lie groups

1 citations · 2 across the 12 of their papers we have counts for

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math.CO2023

Integral Cayley graphs of symmetric groups on transpositions

Alireza Abdollahi, Majid Arezoomand, Mahdi Ebrahimi

We study subsets $T$ consisting of some transpositions $(i, j)$ of the symmetric group $S_{n}$ on ${1, \dots, n}$ such that the Cayley graph $Γ_{T} := C a y (S_{n}, T)$ is an integral graph, i.…

math.CO2023

Littlewood-Richardson coefficients and the eigenvalues of integral line graphs

Mahdi Ebrahimi

We first describe a system of inequalities (Horn's inequalities) that characterize eigenvalues of sums of Hermitian matrices. When we apply this system for integral Hermitian matri…

math.CO2023

A hook formula for eigenvalues of k-point fixing graph

Mahdi Ebrahimi

Let $S_{n}$ denote the symmetric group on $n$ letters. The $k$ -point fixing graph $F (n, k)$ is defined to be the graph with vertex set $S_{n}$ and two vertices $g, h$ of $\math…