Roghayeh Maleki

activity

20202023

collaborators

5 papers

math.CO2023

On the intersection spectrum of $PSL_{2} (q)$

Angelot Behajaina, Roghayeh Maleki, Andriaherimanana Sarobidy Razafimahatratra

Given a group $G$ and a subgroup $H \leq G$ , a set $F \subset G$ is called $H$ \emph{-intersecting} if for any $g, g^{'} \in F$ , there exists $x H \in G / H$ such that $…

math.CO2022

On the intersection density of the symmetric group acting on uniform subsets of small size

Angelot Behajaina, Roghayeh Maleki, Andriaherimanana Sarobidy Razafimahatratra

Given a finite transitive group $G \leq Sym (Ω)$ , a subset $F$ of $G$ is \emph{intersecting} if any two elements of $F$ agree on some element of $Ω…

math.CO2021

On non-normal subgroup perfect codes

Angelot Behajaina, Roghayeh Maleki, Andriaherimanana Sarobidy Razafimahatratra

Let $X = (V, E)$ be a graph. A subset $C \subseteq V (X)$ is a \emph{perfect code} of $X$ if $C$ is a coclique of $X$ with the property that any vertex in $V (X) ∖ C$ is adjace…

math.CO2021

On the second eigenvalue of a Cayley graph of the symmetric group

Roghayeh Maleki, Andriaherimanana Sarobidy Razafimahatratra

In 2020, Siemons and Zalesski [On the second eigenvalue of some Cayley graphs of the symmetric group. {\it arXiv preprint arXiv:2012.12460}, 2020] determined the second eigenvalue…

math.CO2020

$3$ -setwise intersecting families of the symmetric group

Angelot Behajaina, Roghayeh Maleki, Aina Toky Rasoamanana +1

Given two positive integers $n \geq 3$ and $t \leq n$ , the permutations $σ, π \in Sym (n)$ are $t$ -setwise intersecting if they agree (setwise) on a $t$ -subset of $\{1,2,…

On the intersection spectrum of PSL2​(q)

On the intersection density of the symmetric group acting on uniform subsets of small size

On non-normal subgroup perfect codes

On the second eigenvalue of a Cayley graph of the symmetric group

3-setwise intersecting families of the symmetric group

On the intersection spectrum of $PSL_{2} (q)$

$3$ -setwise intersecting families of the symmetric group