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ISSN: 0373-3505    frecuency : 4   format : Electrónica

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Volume 42 Number 1 Year 2086

17 articles in this issue 

Sorin Dragomir

We classify totally geodesic totally-real submanifolds of generalized Hopf manifolds, provided the normal connection is flat.

Pags. 3 - 10  

Mario Abundo

In this paper we consider the family of maps in the unit interval defined by Sa(x)=ax(1-x), x?[0,1], a?[0,4]. For a countable set of values of a for which the a.c. Sa-invariant measure µaexists, we show an almost sure invariance principle for the process ... see more

Pags. 11 - 18  

Carla Giordano, Andrea Laforgia

New monotonicity and convexity properties for the zeros c?k  (k=1,2,...) of the Bessel functions are proved. New inequalities for c?k are also given. These inequalities are useful for small values of ?.

Pags. 19 - 28  

Michele Campiti

In this paper, we give a generalization of a Korovkin-type theorem for set-valued Hausdorff continuous functions (cf. [1] and [2]), by means of upper and lower envelopes.

Pags. 29 - 35  

Anna Martellotti, Anna R. Sambucini

As a consequence of a general Domination Theorem given for a subadditive measure with values in a Riesz space, we prove the arcwise connectedness of the range of a L.C.V.T.S.-valued and of a group-valued finitely additive measure.

Pags. 37 - 48  

Alberto Policriti

An extension of results on the decidability of classes of formulas in set theory is proved. In particular a class of restricted quantified formulas is proved to be decidable also in the case in which the underlying axiomatic set theory does not contain th... see more

Pags. 49 - 66  

Placido Longo

This paper presents a study about the G-convergence of a sequence of variational stochastic obstacle problems to a deterministic one.

Pags. 67 - 86  

Roberto Amato

In this paper we show a local differentiability result and a fundamental estimate for the solutions to non linear basic systems of higher order. Tese results are preliminary to the study of the quasi-holder continuity for non linear parabolic systems of h... see more

Pags. 109 - 120  

Giulia Simi

We extend the duality theory enstablished by Jònsson-Tarski-Halmos for Boolean hemimorphisms to a wider theory and we give some preliminary results.

Pags. 121 - 130  

Alessandro Logar

In this paper we construct a category of effective noetherian rings in which linear equations can be “solved”. This category is closed with respect to some important constructions like trascendental extensions, quotientations, finite products and localiza... see more

Pags. 131 - 150  

Orazio Muscato

Simple waves are studied for a radiating magnetofluid in special relativity. For some of the Riemann invariants explicit expressions are given. The behaviour of these solutions is also studied numerically.

Pags. 151 - 162  

Filippo Chiarenza, Michelangelo Franciosi

In this paper two Harnak inequalities are proved concerning a degenerate elliptic and a degenerate parabolic equation. In both cases the weight giving the degeneracy is a power of the jacobian of a quasiconformal mapping.

Pags. 163 - 170  

Pietro Zamboni

In this paper we compare some function spaces which are relevant to an integral inequality.An unique continuation result for nonnegative solution of elliptic P.D.E.'s is also proved.

Pags. 171 - 178  

Janusz Charatonik, Alfonso Villani

The question (raised in [7]) whether every homogeneous family of separators of a locally connected metrizable space Y, which is a partition of Y and has the continuum power, admits a continuous parametrization, is studied in the realm of locally connected... see more

Pags. 179 - 194  

Renato Maggioni, Alfio Ragusa

The possible degrees for the generators of an irreducible arithmetically Cohen Macaulay curve of P3are computed in terms of its Hilbert function. For any set of admissible degrees a smooth curve of this type, generated in those degrees is constructed.

Pags. 195 - 210  

Riccardo Re

A result about curves in P3obtained by R. Strano is generalized to arbitrary subvarieties of Pn. A curve in P3of degree >4 not contained in a quadric surface is a complete intersection if its generic hyperplane section is a complete intersection: this ... see more

Pags. 211 - 218