M. J. Felipe

activity

20132024

most citedSquare-free class sizes in products of groups

8 citations · 19 across the 14 of their papers we have counts for

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15 papers · 1 filter

math.GR2024

An Arad and Fisman's theorem on products of conjugacy classes revisited

Antonio Beltrán, María José Felipe, Carmen Melchor

A theorem of Z. Arad and E. Fisman establishes that if $A$ and $B$ are two conjugacy classes of a finite group $G$ such that either $A B = A \cup B$ or $A B = A^{- 1} \cup B$ , then $G$ can…

math.GR2024

Some problems about products of conjugacy classes in finite groups

Antonio Beltrán, María José Felipe, Carmen Melchor

We summarize several results about non-simplicity, solvability and normal structure of finite groups related to the number of conjugacy classes appearing in the product or the powe…

math.GR2024

Landau's Theorem on conjugacy classes for normal subgroups

Antonio Beltrán, María José Felipe, Carmen Melchor

Landau's theorem on conjugacy classes asserts that there are only finitely many finite groups, up to isomorphism, with exactly $k$ conjugacy classes for any positive integer $k$ . W…

math.GR2024

Normal subgroups whose conjugacy class graph has diameter three

Antonio Beltrán, María José Felipe, Carmen Melchor

Let $G$ be a finite group and $N$ a normal subgroup of $G$ . We determine the structure of $N$ when the diameter of the graph associated to the $G$ -conjugacy classes contained in $N…

math.GR2024

Powers of conjugacy classes in a finite group

Antonio Beltrán, Rachel Deborah Camina, María José Felipe +1

Many results have been established that show how the number of conjugacy classes appearing in the product of classes affect the structure of a finite group. The aim of this paper i…

math.GR2024

Multiplying a conjugacy class by its inverse in a finite group

Antonio Beltrán, María José Felipe, Carmen Melchor

Suppose that $G$ is a finite group and $K$ a non-trivial conjugacy class of $G$ such that $K K^{- 1} = 1 \cup D \cup D^{- 1}$ with $D$ a conjugacy class of $G$ . We prove that $G$ is not a…

math.GR2024

Squares of real conjugacy classes in finite groups

Antonio Beltrán, María José Felipe, Carmen Melchor

We prove that if a finite group $G$ contains a conjugacy class $K$ whose square is of the form $1 \cup D$ , where $D$ is a conjugacy class of $G$ , then $⟨ K ⟩$ is a solv…

math.GR2024

Triangles in the graph of conjugacy classes of normal subgroups

Antonio Beltrán, María José Felipe, Carmen Melchor

Let $G$ be a finite group and $N$ a normal subgroup of $G$ . We determine the structure of $N$ when the graph $Γ_{G} (N)$ , which is the graph associated to the conjugacy classes of $G$ …

math.GR2024

Graphs associated to conjugacy classes of normal subgroups in finite groups

Antonio Beltrán, María José Felipe, Carmen Melchor

Let $G$ be a finite group and let $N$ be a normal subgroup of $G$ . We attach to $N$ two graphs $Γ_{G} (N)$ and $Γ_{G}^{*} (N)$ related to the conjugacy classes of $G$ contained in $N$ …

math.GR2020

On products of groups and indices not divisible by a given prime

María-José Felipe, Lev S. Kazarin, Ana Martínez-Pastor +1

Let the group $G = A B$ be the product of subgroups $A$ and $B$ , and let $p$ be a prime. We prove that $p$ does not divide the conjugacy class size (index) of each $p$ -regular eleme…

math.GR2019

On zeros of irreducible characters lying in a normal subgroup

M. J. Felipe, N. Grittini, V. Sotomayor

Let $N$ be a normal subgroup of a finite group $G$ . In this paper, we consider the elements $g$ of $N$ such that $χ (g) \neq = 0$ for all irreducible characters $χ$ of $G$ . Such an ele…

math.GR2018★ 5 cited

Zeros of irreducible characters in factorised groups

M. J. Felipe, A. Martínez-Pastor, V. M. Ortiz-Sotomayor

An element $g$ of a finite group $G$ is said to be vanishing in $G$ if there exists an irreducible character $χ$ of $G$ such that $χ (g) = 0$ ; in this case, $g$ is also called a zero…

math.GR2017★ 6 cited

Prime power indices in factorised groups

M. J. Felipe, A. Martínez-Pastor, V. M. Ortiz-Sotomayor

Let the group $G = A B$ be the product of the subgroups $A$ and $B$ . We determine some structural properties of $G$ when the $p$ -elements in $A \cup B$ have prime power indices in $G…

math.GR2017★ 8 cited

Square-free class sizes in products of groups

M. J. Felipe, A. Martínez-Pastor, V. M. Ortiz-Sotomayor

We obtain some structural properties of a factorised group $G = A B$ , given that the conjugacy class sizes of certain elements in $A \cup B$ are not divisible by $p^{2}$ , for some prim…

math.GR2013

Nilpotent and Abelian Hall Subgroups in Finite Groups

Antonio Beltrán, María José Felipe, Gunter Malle +4

We give a characterization of the finite groups having nilpotent or abelian Hall $π$ -subgroups which can easily be verified from the character table.