Le Matematiche  

Ahmad Ageeb, A. M. Hassanein, R. M. Salem

In this paper we show that if M is an Ordered monoid then the twisted monoid ring R^T M is (left principally) quasi-Baer if and only if R is (left principally) quasi-Baer. Also if R is (left principally) quasi-Baer and G is an ordered group acting on R we... see more

Mridula Garg, Lata Chanchlani

In the present paper, we define right and left sided Kober fractional q-derivative operators and show that these derivative operators are left inverse operators of Kober fractional q-integral operators. We obtain the images of generalized basic hypergeome... see more

S. K. Vaidya, D. D. Bantva

 An L(2,1)-labeling of a graph G is a function f  from the vertex set V(G) to the set of all nonnegative integers such that | f (x)- f (y)| = 2 if d(x, y) = 1 and | f (x) - f (y)| = 1 if d(x, y) = 2. The L(2,1)-labeling number ?(G) of G is the s... see more

Sandro Rajola, Maria Scafati Tallini

We define a new colouring for a hypergraph, in particular for a graph. Such a method is a partition of the vertex-set of a hypergraph, in particular of a graph. However, it is more intrinsically linked to the geometric structure of the hypergraph and ther... see more

Shyam L. Kalla, Alka Rao

Aim of the present paper is to investigate a new integral inequality of Grüss type for a hypergeometric fractional integral. Two main results are proved, the first one deals with Grüss type inequality using the hypergeometric fractional integral. The seco... see more

G. Murugusundaramoorthy, N. Magesh, R. K. Raina

In the present investigation, we obtain some subordination and superordination results for the Hadamard product of certain normalized analytic functions in the open unit disk involving the linear operator introduced in [J. Dziok and R. K. Raina, Demonstra... see more

Salvatore Angelo Marano, Gabriele Bonanno

Papers communicated at the first International WorkshopVariational, Topological and Set-Valued Methodsfor Nonlinear Differential Problemsheld during April 14 –16 2010, at the Engineering Faculty of the University of Messina.

Diego Averna, Stefania Maria Buccellato, Elisabetta Tornatore

In this paper we prove the existence of infinitely many solutions for a mixed boundary value problem involving the one dimensional p-Laplacian. A result on the existence of three solutions is also established. The approach is based on multiple critical po... see more

Gabriele Bonanno, Antonia Chinnì

Multiplicity of solutions for p(x)-Laplacian Dirichlet problems is investigated. The approach is based on the critical point theory. The ordinary case is pointed out.

Alberto Boscaggin

We revisit some recent results obtained in [1] about the existence of subharmonic solutions for a class of (nonautonomous) planar Hamiltonian systems, and we compare them with the existing literature. New applications to undamped second order equations ar... see more

Giuseppina D'Aguì, Roberto Livrea

In this paper we present some recent multiplicity results for a class of second order Hamiltonian systems. Exploiting the variational structure of the problem, it will be shown how the existence of multiple, even infinitely many, periodic solutions can be... see more

Giuseppina D'Aguì, Giovanni Molica Bisci

The main purpose of this paper is to present recent existence results for an elliptic eigenvalue Dirichlet problem. Precisely, our method ensures the existence of an exactly determined open interval (possibly unbounded) of positive parameters for which th... see more

Moussa Chrif, Said El Manouni

We prove the existence of weak solutions to some nonlinear elliptic equations governed by an anisotropic operator mapping an appropriate function space to its dual. A sign condition with no growth restrictions with respect to the variable solution is impo... see more

Maurizio Garrione

The first part of the paper surveys the concept of resonance for T-periodic nonlinear problems. In the second part, some new results about existence conditions for nonlinear planar systems are presented. In particular, the Landesman-Lazer conditions are g... see more

Pasquale F. Pizzimenti, Angela Sciammetta

The aim of this paper is to establish the existence of at least one non-trivial solution for Neumann quasi-linear problems. Our approach is based on variational methods.

Marianna Tavernise, Alessandro Trombetta, Giulio Trombetta

We present a compactness criterion of Vitali-type in a class of vector-valued real F-seminormed spaces, which satisfy the W-property.