Le Matematiche  

Olga A. Podkorytova

Asymptotics of the tail probability for L^1 -norm of the centered Brownian bridge is obtained.

Harold Exton

New compact triple series solutions of the confluent Heun equation (CHE) are obtained by the appropriate applications of the Laplace transform and its inverse to a suitably constructed system of soluble differential equations. The computer-algebra package... see more

Ji-Cheng Hou

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Anna Maria Paolucci, Ioannis Tsohantjis

We present a method of constructing known deformed or undeformed oscillators as quotients of certain models of Hopf-type oscillator algebras, using similar techniques to those of determining fix point sets of the adjoint action of a Hopf algebra. Moreover... see more

Lucyna Rempulska, Mariola Skorupka

We consider Szasz-Mirakyan operators in polynomial and exponential weighted spaces of functions of two variables. We give Voronowskaya type theorem and theorem on convergence of certain sequences.

Antonio Martinón, F. Pérez-Acosta

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Tilak Bhattacharya

In this work we study the well known Faber-Krahn  inequality for planar domains. Let u>0 be the first eigenfunction of the Laplacian on a bounded domain and ?_1 be the first eigenvalue. Let ?^*_1  be the first eigenvalue for the symmetrized d... see more

Giuseppe Gentile

Two concepts of automorphism of a hypergroupoid are introduced; the first one preserve the algebraic structure of a hypergroupoid, the second one preserve the geometric structure that one can associate naturally to a hypergroupoid. The groups of such auto... see more

Ugo Gianazza, Vincenzo Vespri

The well known characterization ofHölder classes as interpolation spaces is here extended under suitable hypotheses to a class of spaces wherethe Hölder continuity is given in terms of an intrinsic distance relative to degenerate elliptic operators of Hör... see more

R. K. Saxena

A number of papers have appeared in literature in which certain functional relations associated with hypergeometric functions and Digamma function ?(z) are derived. In order to unify and extend the existing results due to Kalla [7]. Kalla and Ross [9], Al... see more

Domenico Freni

In this paper we forward in the investigation of the matroidal M_? -hypergrupoids introduced in [13]. We give necessary and sufficient conditions for such hypergrupoid to be matroidal; moreover, we find its cardinality and we analyse the properties of the... see more

Antonio Causa

Let G(d, s) be the maximum genus of a smooth irreducible curve in P^3 of degree d not contained in any surfaces of degree less then s and G(d,s,s ) the maximum genus of curves as before subject to the further condition that their general plane section is ... see more

Edoardo Ballico, Antonino Cossidente

Here we study the Hilbert function of the points rational over a fixed finite field  GF(q),  q = pe of some Del Pezzo surfaces and of the Veronese plane. This work is motivated by the equivalence (due to Moorhouse) between the knowledge of the H... see more

Werner Oettli, Dirk Schläger

In the present note, a minimax theorem is given which combines the most general topological and quantitative conditions employed in the literature. This result encompasses a large part of the classes of topological, quantitative, and mixed minimax theorem... see more