Rendiconti dell’Istituto di Matematica dell’Università di Trieste: an International Journal of Mathematics vol.51 (2019)https://www.openstarts.units.it/handle/10077/270622024-07-22T23:35:01Z2024-07-22T23:35:01Z91Rendiconti dell’Istituto di matematica dell’Università di Trieste. An International Journal of Mathematics. Vol. 51 (2019)Università degli Studi di Trieste, Dipartimento di Matematica e Informaticahttps://www.openstarts.units.it/handle/10077/294132021-04-19T08:00:49Z2019-01-01T00:00:00Zdc.title: Rendiconti dell’Istituto di matematica dell’Università di Trieste. An International Journal of Mathematics. Vol. 51 (2019)
dc.contributor.author: Università degli Studi di Trieste, Dipartimento di Matematica e Informatica
dc.description.abstract: Rendiconti dell’Istituto di Matematica dell’Università di Trieste was founded in 1969 by Arno Predonzan, with the aim of publishing original research articles in all fields of mathematics and has been the first Italian mathematical journal to be published also on-line. The access to the electronic version of the journal is free. All published articles are available on-line. The journal can be obtained by subscription, or by reciprocity with other similar journals. Currently more than 100 exchange agreements with mathematics departments and institutes around the world have been entered in.
2019-01-01T00:00:00ZOn upper and lower bounds for finite group-actions on bounded surfaces, handlebodies, closed handles and finite graphsZimmermann, Bruno P.https://www.openstarts.units.it/handle/10077/293342024-07-22T00:13:53Z2019-01-01T00:00:00Zdc.title: On upper and lower bounds for finite group-actions on bounded surfaces, handlebodies, closed handles and finite graphs
dc.contributor.author: Zimmermann, Bruno P.
dc.description.abstract: In the present paper, partly a survey, we discuss upper and lower bounds for finite group-actions on bounded surfaces, 3-dimensional handlebodies and closed handles, handlebodies in arbitrary dimensions and finite graphs (the common feature of these objects is that they have all free fundamental group).
2019-01-01T00:00:00ZConvexity, topology and nonlinear differential systems with nonlocal boundary conditionsMawhin, JeanSzymanska-Debowska, Katarzynahttps://www.openstarts.units.it/handle/10077/293332024-07-22T00:06:06Z2019-01-01T00:00:00Zdc.title: Convexity, topology and nonlinear differential systems with nonlocal boundary conditions
dc.contributor.author: Mawhin, Jean; Szymanska-Debowska, Katarzyna
dc.description.abstract: This paper is a survey of recent existence results for solutions of first and second order nonlinear differential systems with nonlocal boundary conditions using methods based upon convexity, topological degree and maximum-principle like techniques.
2019-01-01T00:00:00ZOn elliptic curves of bounded degree in a polarized Abelian varietyGuerra, Luciohttps://www.openstarts.units.it/handle/10077/270682024-07-22T00:07:24Z2019-01-01T00:00:00Zdc.title: On elliptic curves of bounded degree in a polarized Abelian variety
dc.contributor.author: Guerra, Lucio
dc.description.abstract: For a polarized complex Abelian variety $A$ we study the function $N_A(t)$
counting the number of elliptic curves in $A$ with degree bounded by $t$.
This extends our previous work in dimension two.
We describe the collection of elliptic curves in the product $A = S \times F$ of an
Abelian variety and an elliptic curve by means of an explicit parametrization, and
in terms of the parametrization we express the degrees of elliptic curves
relative to a split polarization.
When this is applied to the self product $A = E^k$ of an elliptic curve,
it turns out that an asymptotic estimate of the counting function $N_A(t)$ can
be obtained from an asymptotic study of the degree form on the group of endomorphisms of the elliptic curve.
2019-01-01T00:00:00ZChange of variables’ formula for the integration of the measurable real functions over infinite-dimensional Banach spacesASCI CLAUDIOhttps://www.openstarts.units.it/handle/10077/270672024-07-22T00:02:57Z2019-01-01T00:00:00Zdc.title: Change of variables’ formula for the integration of the measurable real functions over infinite-dimensional Banach spaces
dc.contributor.author: ASCI CLAUDIO
dc.description.abstract: In this paper we study, for any subset\ $I$\ of $\mathbf{N}^{\ast}$ and for
any strictly positive integer $k$, the Banach space $E_{I}$ of the bounded
real sequences $\left\{ x_{n}\right\} _{n\in I}$, and a measure over
$\left( \mathbf{R}^{I},\mathcal{B}^{(I)}\right) $ that generalizes the
$k$-dimensional Lebesgue one. Moreover, we recall the main results about the
differentiation theory over $E_{I}$. The main result of our paper is a change
of variables' formula for the integration of the measurable real functions on
$\left( \mathbf{R}^{I},\mathcal{B}^{(I)}\right) $. This change of variables
is defined by some functions over an open subset of $E_{J}$, with values on
$E_{I}$, called $\left( m,\sigma\right) $-general, with properties that
generalize the analogous ones of the finite-dimensional diffeomorphisms.
2019-01-01T00:00:00ZAsymptotic behavior for the elasticity system with a nonlinear dissipative termDilmi, MohamedDilmi, MouradBenseridi, Hamidhttps://www.openstarts.units.it/handle/10077/270662024-07-22T00:05:02Z2019-01-01T00:00:00Zdc.title: Asymptotic behavior for the elasticity system with a nonlinear dissipative term
dc.contributor.author: Dilmi, Mohamed; Dilmi, Mourad; Benseridi, Hamid
dc.description.abstract: We study the asymptotic behavior of an elasticity problem
with a nonlinear dissipative term in a bidimensional thin domain
Ωε. We prove some convergence results when the thickness tends to
zero. The specific Reynolds limit equation and the limit of Tresca free
boundary conditions are obtained.
2019-01-01T00:00:00ZA counterexample to a priori bounds under the Ahmad-Lazer-Paul conditionBOSCAGGIN, ALBERTOGARRIONE Mauriziohttps://www.openstarts.units.it/handle/10077/270652024-07-22T00:06:53Z2019-01-01T00:00:00Zdc.title: A counterexample to a priori bounds under the Ahmad-Lazer-Paul condition
dc.contributor.author: BOSCAGGIN, ALBERTO; GARRIONE Maurizio
dc.description.abstract: In the context of scalar second order ODEs at resonance,
we construct a counterexample showing that, in general, the Ahmad-
Lazer-Paul condition does not imply a priori bounds for T-periodic solutions.
2019-01-01T00:00:00ZThird Hankel determinant for a subclass of analytic functions of reciprocal order defined by Srivastava-Attiya integral operatorChallab, K. A.Darus, M.Ghanim, F.https://www.openstarts.units.it/handle/10077/270642024-07-22T00:13:24Z2019-01-01T00:00:00Zdc.title: Third Hankel determinant for a subclass of analytic functions of reciprocal order defined by Srivastava-Attiya integral operator
dc.contributor.author: Challab, K. A.; Darus, M.; Ghanim, F.
dc.description.abstract: The aim of this paper is to investigate coefficient estimates,
Fekete-Szeg˝o inequality, and upper bound of third Hankel determinant
for a subclass of analytic functions of reciprocal order defined
by Srivastava-Attiya integral operator.
2019-01-01T00:00:00ZAn effective criterion for the additive decompositions of formsBALLICO, EDOARDOhttps://www.openstarts.units.it/handle/10077/270632024-07-22T00:03:12Z2019-01-01T00:00:00Zdc.title: An effective criterion for the additive decompositions of forms
dc.contributor.author: BALLICO, EDOARDO
dc.description.abstract: We give an effective criterion for the identifiability of
additive decompositions of homogeneous forms of degree d in a fixed
number of variables. Asymptotically for large d it has the same order
of the Kruskal’s criterion adapted to symmetric tensors given by L.
Chiantini, G. Ottaviani and N. Vannieuwenhoven. We give a new case
of identifiability for d = 4.
2019-01-01T00:00:00Z