Le Matematiche  

Paola Mannucci

We anlyse a mathematical model for absorption and diffusion of a fluid in ultra-napkins. We consider a diffusion equation coupled with an ordinary differential equation, subjected to a discontinuous Neumann boundary condition.We prove the existence and th... see more

H. K. Pathak, Y. J. Cho, S. M. Kang, B. S. Lee

In this paper, we prove some common fixed point theorems for compatible mappings of type (P). As applications, the existence and uniqueness of common solutions for a class of the functional equations in dynamic programming are discussed.

Arjun K. Rathie, Vishakha Nagar

The aim of this paper is to obtain single series expression fore-x/2 1F1(a;2 a+i;x)for i=1 and i=-1. For i=0, we have the well known Kummer's second theorem. The results are derived with the help of generalized Gauss's second summation theorem recently o... see more

Biagio Palumbo

The object of this paper is the set of the "arithmetical multiplicative functions", i.e. the functions N --> C for which f(mn)=f(n)f(m), under the condition that m and n have no common factors. This set is a group with respect to the Dirichlet's convol... see more

Anton L. W. von Bachhaus

Part I - By combining a general 2nd-order linear homogeneous ordinary differential equation with the three-term recurrence relation possessed by all orthogonal polynomials, it is shown that sequences of orthogonal polynomials which satisfy a differential ... see more

Giovanni Emmanuele

We present some results essentially showing that cabv(?, E) lives inside cabv(?, E) if and only if l_\infty lives inside cabv(?, E). Some applications of this result to other questions (existence of complemented copies of c0 and lifting of the Gelfand-Ph... see more

Liliana Pavel

It is known that a complex valued function f on a Clifford ?-semigroup, T=UnGn is positive definite if and only if its restriction fn to Gn, is positive definite for any positive integer n. Then, by the usual Gelfand-Naimark-Segal construction, f and fn (... see more

Hidetoshi Maeda

Let E be an ample vector bundle of rank >1 on a smooth complex projective variety X of dimension n. This paper gives a classification of pairs (X,E) whose adjoint bundles K_X+det E are not nef in the case when  r=n-2.

Dumitru Popa

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Mohamed abd el-Hady Kassem

This paper deals with multiobjective nonlinear programming problems, with parameters in the objective functions, without differentiability assumptions on the considered functions. The stability notions like the solvability set and stability sets of the fi... see more

Domenico Cantone, Rosa Ruggeri Cannata

In this paper we give a decidable tableau calculus for the unquantified theory MLSSF, which involves in addition the constructs of Multilevel Syllogistic, namely 'membership', 'equality', 'set inclusion', 'binary union', 'binary intersection' and 'set dif... see more

Angelo Gilio, Fulvio Spezzaferri

In this paper a review of some general results on coherence of conditional probability assessments is given. Then, a necessary and sufficient condition on coherence of two finite families of discrete conditianal probability distributions, represented by t... see more

Elena Guardo, Ornella Parisi

Let X be a finite set of distinct points lying on an irreducible surface with Hilbert function H(X,i). In this paper we will prove that the maximum number of generators, in each degree, of the ideal defining X is obtained by the second difference of the H... see more

Maria Stella Fanciullo

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Riccardo Re

We use a geometrical approach to the study of the vector subspaces M in a determinantal variety in Hom(V,W) and derive conditions on dim(M) for M to belong to certain distingiushed classes of subspaces.

Lorenzo Milazzo

A mixed hypergraph is characterized by the fact that it possesses anti-edges as well as edges. In a colouring of a mixed hypergraph, every anti-edge has at least two vertices of the same colour and every edge has at least two vertices coloured differently... see more