Le Matematiche  

Ebrahim Youness

The problem dual to a multi-objective fractional programming problems is defined by using the concept of dual space of the objective space and using the concept of subgradient. Some assumptions considered in recent works are relaxed in our proposed approa... see more

Marilena Crupi

Let A be a local ring of characteristic p>0 which has a p-basis over a subring C, and B be the subring of constants of A for a derivation (or derivations ) of A over C. We give a sufficient condition for B to have a p-basis over C. We add some examples... see more

Giovanni Emmanuele

We show that certain quotients of Banach spaces with the (NRNP) have the same property.

Gunnar F. Stefansson

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Herbert Zeitler

It's of great interest, to find systems S(2,4,v) with subsystems S(2,4,r=1/3(v-1)) – known as maximal subsystems. Up to now there exist only a few results – mainly due to Resmini and Shen. In this paper we prove a new partial result: Exactly for all v?{12... see more

Adele Ferone

We study the problem of the minimization of the energy type functional F(f)=?Of G f on a class of function with prescribed distribution function that we denote by C(f0). We will prove that there exists only one minimizer of the functional considered in th... see more

Antonella Fiacca, Susanna Vercillo

In the present paper it is proved the K-continuity of a set-valued function which is K-hull midconvex, K-lower semicontinuous at a point and whose values are bounded K-midconvex sets; the concept of K-hull midconvexity is introduced here and it is weaker ... see more

Salvatore Ingrassia, Enrico Commis

The problem of automatic discrimination among pictures concerning either defects or calyces in oranges is approached. The method here proposed is based on a statistical analysis of the grey-levels and the shape of calyces in the pictures. Some suitable st... see more

Carmela Vitanza

In this paper we continue the study of a class of second order elliptic equations we began in [7] improving the assumptions on the lower order terms.

Giovanna Ilardi

We prove that a projective hypersurface of P4(C), whose simple points are 1-parabolic and having determined hessian cannot be multiple components of its hessian.

Dian K. Palagachev

Global solvability and uniqueness results are established for Dirichlet's problem for a class of nonlinear differential equations on a convex domain in the plane, where the nonlinear operator is elliptic in sense of Campanato. We prove existence by means ... see more

Maria Alessandra Ragusa

We prove a Sobolev-Adams weighted imbedding using an idea of E. M. Stein.

Luisa Fattorusso

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Giovanni Fiorito, Rosario Musmeci, Mario Strano

n this paper we give a new proof of a known diophantine approximation result, then we apply this to prove convergence of a class of series in a Banach space, whose terms are defined recursively.

Cristiana Sacchi

Let A be a projective manifold of dimension n at least 3 contained as an ample divisor in a projective manifold X and let L=OX(A). In this paper we study the pairs (X,L) in the following two cases:         i) A a Fano ma... see more

E. De Pascale, G. Marino, P. Pietramala

We prove some general theorems on the convergence of successive approximations xn=Axn-1 to a fixed point of a nonlinear contraction mapping A defined on an E-metric space. We derive, as applications, some fixed point theorems in uniform spaces and an abst... see more