Étude de la propriété de Markov étroite en relation avec les processus planaires à accroissements indépendants
Stability properties of a class of viscoelastic beams of the hereditary type
The paper deals with the problem of equilibrium stability of prismatic, homogeneous, intrinsically isotropic, viscoelastic beams subjected to the action of constant compressive axial force in the light of Lyapounov's stability theory. For a class of functional expressions of creeping kernels characteristic of no-aging viscoelastic materials of the hereditary type, solution of the governing integro-differential equations is given. Referring to polymeric materials of the PMMA type, numerical results...
A footnote to a paper by Noma
Let be a globally generated ample vector bundle of rank on a complex projective smooth surface . By extending a recent result by A. Noma, we classify pairs as above satisfying .
Quadro-quadric Cremona transformations in low dimensions via the -correspondence
It has been previously established that a Cremona transformation of bidegree (2,2) is linearly equivalent to the projectivization of the inverse map of a rank 3 Jordan algebra. We call this result the “”. In this article, we apply it to the study of quadro-quadric Cremona transformations in low-dimensional projective spaces. In particular we describe new very simple families of such birational maps and obtain complete and explicit classifications in dimension 4 and 5.
On minimal non--groups
A group is said to be a -group, if is a polycyclic-by-finite group for all . A minimal non--group is a group which is not a -group but all of whose proper subgroups are -groups. Our main result is that a minimal non--group having a non-trivial finite factor group is a finite cyclic extension of a divisible abelian group of finite rank.
On the regularity of stochastic currents, fractional brownian motion and applications to a turbulence model
We study the pathwise regularity of the map ↦()= 〈( ), d 〉, where is a vector function on ℝ belonging to some Banach space , is a stochastic process and the integral is some version of a stochastic integral defined via regularization. A continuous version of this map, seen as a random element of the topological dual of will be called . We give sufficient conditions for the current to live in some Sobolev space of distributions and we...
The generalized commutativity degree in a finite group.
Anti-CC-groups and anti-PC-groups.
m-order integrals and generalized Itô's formula ; the case of a fractional brownian motion with any Hurst index
Contributo di diaframmi orizzontali alla resistenza sismica di strutture murarie a navata
Con riferimento a configurazioni geometriche schematiche di strutture murarie tipiche dell'edilizia monumentale si analizzano gli stati tensionali di carattere prevalentemente flessionale indotti nelle pareti verticali da azioni orizzontali da sisma. L'analisi è finalizzata alla definizione quantitativa della efficacia di interventi di integrazione statica che prevedono l'inserimento di un traliccio orizzontale in acciaio al livello del piano di gronda del tetto, capace di costituire diaframma orizzontale...
Two bounds on the noncommuting graph
Erdős introduced the noncommuting graph in order to study the number of commuting elements in a finite group. Despite the use of combinatorial ideas, his methods involved several techniques of classical analysis. The interest for this graph has become relevant during the last years for various reasons. Here we deal with a numerical aspect, showing for the first time an isoperimetric inequality and an analytic condition in terms of Sobolev inequalities. This last result holds in the more general...
Conjugately dense subgroups in generalized FC-groups.
A survey on just-non- groups.
On a property of groups with coverings.
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