Ricerche di Matematica
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A note on the supersolubility of a group with ms-supersoluble factors
Ricerche di Matematica - Tập 70 - Trang 517-521 - 2020
A subgroup A of a group G is called seminormal in G, if there exists a subgroup
B such that $$G=AB$$ and AX is a subgroup of G for every subgroup X of B. Let
G be a supersoluble group. Then it has an ordered Sylow tower of supersoluble
type $$1=G_0< G_1< \cdots < G_m=G$$ . If for every i all maximal subgroups of
$$G_{i}/G_{i-1}$$ are seminormal in $$G/G_{i-1}$$ , then G is said to be
ms-superso...
On the influence of diffusion on the competition between bacteria and innate immune system of invertebrates
Ricerche di Matematica - Tập 59 Số 2 - Trang 165-185 - 2010
On sylowizers in finite p-soluble groups
Ricerche di Matematica - Tập 56 - Trang 189-194 - 2007
In general, given a finite group G, a prime p and a p-subgroup R of G, the
sylowizers of R in G are not conjugate. In this paper we afford some conditions
to achieve the conjugation of the sylowizers of R in a p-soluble group G, among
others...
On semicomplete finite p-groups
Ricerche di Matematica - Tập 72 - Trang 417-422 - 2022
Let G be a finite group and N be a non-trivial proper normal subgroup of G. The
pair (G, N) is called a Camina pair if $$xN\subseteq x^G$$ for all $$x\in
G\setminus N$$ , where $$x^G$$ denotes the conjugacy class of x in G. Also let
$$\mathrm {Aut}^{G'}(G)$$ denote the group of all automorphisms of G fixing
$$G/G'$$ elementwise. A group G is called semicomplete if $$\mathrm
{Aut}^{G'}(G)=\mathrm {...
Finite planar spaces with projective points
Ricerche di Matematica - Tập 58 - Trang 263-270 - 2009
In this paper a class of finite planar spaces with projective points is
characterized.
Exponential stability of a coupled wave system with thermal effects
Ricerche di Matematica - - Trang 1-17 - 2022
This paper is concerned with the stability of a coupled wave system in
one-dimensional space with thermal effects, which is coupled by velocities. We
prove the well-posedness of the system by using Lumer-Phillips theorem, and then
turn out the exponential stability of the system via the semigroup method. The
main novelty of this paper is that the heat-affected system achieves exponential
stability...
Almost symmetric good semigroups
Ricerche di Matematica - - Trang 1-15 - 2023
The class of good semigroups is a class of subsemigroups of $${\mathbb {N}}^h$$
, that includes the value semigroups of rings associated to curve singularities
and their blowups, and allows to study combinatorically the properties of these
rings. In this paper we give a characterization of almost symmetric good
subsemigroups of $${\mathbb {N}}^h$$ , extending known results in numerical
semigroup t...
Weighted $$p(\cdot )$$-Laplacian problem with nonlinear singular terms
Ricerche di Matematica - Tập 72 Số 1 - Trang 45-62 - 2023
New general and explicit stability result for a thermoelastic Timoshenko system
Ricerche di Matematica - Tập 71 - Trang 735-755 - 2021
The goal of this article is to study a thermoelastic Timoshenko system with
viscoelastic law acting on the shear force and thermoelastic dissipation acting
on the bending moment. We prove a general decay as well as an explicit decay
estimate for solution energy, from which the exponential and polynomial decay
results are only special cases. The result is obtained without imposing
equal-wave-speed ...
Two classes of exact solutions in the linear elastodynamics of transversely isotropic solids
Ricerche di Matematica - - 2024
Due to the formal resemblance of some models for the Cauchy stress tensor of
elastic solids and viscous fluids, some classes of exact solutions for the
equations governing the flows in Navier–Stokes fluids have been generalized to
linear and nonlinear elastodynamics. In this paper, we study the conditions
under which two special classes of generalized Beltrami flows, the vortices in
lattice form a...
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