Le Matematiche  

Suzanne Daoud

In this paper, we consider the space X of all Entire functions represented by Dirichlet series equipped with various topologies. The main result is concerned with finding certain continuous linear operators which are used to determine the proper bases in ... see more

Danut Marcu

In this paper, we give the maximal number of (k+r)-colouring of a graph with n vertices and chromatic number k. Also, we obtain the maximal values for chromatic polynomial of a graph.

Ornella Fiodo, Salvatore Giuga

An optimal control problem for a parabolic operator of order 2m with the boundary conditions containing the control is considered. A regularity theorem for the parabolic problem and the regularity of the optimal control is proved.

Marco Bramanti

In this paper we deal with a uniformly elliptic operator of the kind: Lu ? Au + Vu, where the principal part A is in divergence form, and V is a function assumed in a “Kato class”. This operator has been studied in different contexts, especially using pro... see more

Alberto Alzati, Marina Bertolini

Complex, smooth, projective Fano varieties were classified by Iskovskih when B2 =1 (B2 is the second Betti number) and by Mori and Mukai when B2  is at least 2. When B2 =1 it is known if such varieties are rational (unirational) or not; in this pape... see more

Domenico Freni

It is shown that in type U hypergroups on the right of ?5 cardinality, the right scalar identity is equal to the left scalar identity. This property is not true if the cardinality is at least 6 where counter-examples are determined.

Corrado Tanasi

We study obstructions to surgery in dimension 3 and 4 coming from Sullivan's theory of minimal models. We also give applications of this obstructions theory to the theory of defects in ordered media (appearing in condensed matter physics).

J. J. Charatonik, K. Omiljanowski, Biagio Ricceri

A pair (X,Y) of topological spaces X and Y is said to have the graph intersection property provided that for each continuous function g: X?Y, if a connected subset of X? Y projects onto the whole Y, then it intersect the graph of g. Various relations bet... see more

Luisa Fattorusso, Giovanna Idone

See directly the article.

L. Maria Abatangelo

We study the first order prolongations of derived G-structures (in the sense of P. Dazord [9]) on a differentiable manifold. We give necessary and sufficient conditions (in terms of structure functions) for the complete integrability of the differentiable... see more

Claudio Barone, Santo Motta

If the collisions are redefined as a flux a kinetic conservation law can be written in divergence form. This can be handled numerically, in the framework of Finite Particle Approximation, using the CRF-method. In the present paper the relevant quantities ... see more

Carmela Vitanza

We prove a well-posedness result in the intersection class of W2,p with W01,p for the Dirichlet problem (*) below. We assume L to be an elliptic second order operator with discontinuous coefficients and lower order terms. The paper extends a recent result... see more