Le Matematiche  

Edoardo Ballico, Elizabeth Gasparim

Here we study holomorphic vector bundles on a two-dimensional holomorphically convex complex manifold Y . We present some characterizations of Y under which torsion free sheaves are filtrable. In the case when Y = X × C, where X is a connected compact Rie... see more

Bruce Calvert

In a finite network, there is a classical theory of traffic flow, which gives existence of a Wardrop equilibrium for given OD demands and affine route costs. In this note, the existence theory is extended to infinite networks.

Liliana Gabriela Gheorghe

We define the analytic Besov spaces on a bounded symmetric domain associated with a rearrangement invariant space, give a description in terms of certain differential operators, prove an interpolation theorem and find their dual space; finally, as an appl... see more

Carlos C. Peña

Topological algebras of sequences of complex numbers are introduced, endowed with a Hadamard product type. The complex homomorphisms on these algebras are characterized, and units, prime cyclic ideals, prime closed ideals, and prime minimal ideals, discus... see more

M. H. Fahmy, M. A. Abdou, E. I. Deebs

A series method is used to separate the variables of position and time for the Fredholm-Volterra integral equation of the first kind and the solution of the system in L_2 [0,1] × C[0,T], 0 = t = T < 8 is obtained, the Fredholm integral equation is disc... see more

Marina Mancini

In this paper we consider the nondegenerate projectively Cohen-Macaulay (p.C.M.) surfaces of small degree in P^5 . We determine those of degree d = 9  and all candidate rational surfaces as p.C.M. surfaces.

Veronica Biazzo

In this paper, we illustrate an implementation with Maple V of some procedures which allow to exactly propagate precise and imprecise probability assessments. The extension of imprecise assessments is based on a suitable generalization of the concept of c... see more

Nassar H. Abdel-All

This article presents a new distribution of Clifford Klein manifolds. Special kinds of the distribution, under some assumption, are studies. The geometrical properties of the K-manifolds in the considered distribution are given. The relations between Gaus... see more

Giuseppe Di Fazio, Pietro Zamboni

We consider the generation of analytic semigroups by elliptic operators with discontinuous coefficients.

Lucyna Rempulska, Zbigniew Walczak

We introduce certain modified Szasz - Mirakyan operators in exponential weighted spaces of functions of one variable. We give theorems on the degree of approximation and the Voronovskaya type theorem.

Salvatore Giuffrida, Renato Maggioni

Let X be a smooth projective variety over an algebraically closed field k. We associate to X , in a functorial way, a multigraded k-algebra G(X), called the global ring of X . We find some results when dim X = 2, and we explicitly determine the global rin... see more

Giovanni Mascali

In the attempt of obtaining macroscopic models which describe the flow of electrons through a semiconductor crystal, many authors start from the Boltzmann transport equation, often using a generalized BGK type approximation for the collision operator. In ... see more

Mark Buckles, Elena Guardo, Adam Van Tuyl

We study homogeneous schemes of fat points in P^2  whose support is either a complete intersection (CI for short) constructed on an a × b grid or a CI minus a point,

Mark Buckles, Elena Guardo, Adam Van Tuyl

We study homogeneous schemes of fat points in P^2 whose support is either a complete intersection (CI for short) generated by two generic forms or a CI minus a point.

Tommaso De Fernex

Let E be an ample vector bundle of rank r = 2 on a smooth complex projective variety X.  This work is part of the following problem: to study and classify the pair (X, E) assuming the existence of a regular section s ?G (X, E) whose zero locus is a s... see more